Description
Also known as step drill bits, cone drill bits or multi-size drill bits, these tools are useful for electricians, plumbers, metal fabricators, technicians, mechanics and DIY users in Kenya.
A typical 5-piece HSS step drill set provides several hole sizes, with selected kits covering diameters from 4mm to 35mm. The exact sizes depend on the manufacturer and model.
5 Pieces Step Drill Bits Specifications
| Specification | Details |
|---|---|
| Product Name | 5 Pieces Step Drill Bits Set |
| Tool Category | Drilling accessories |
| Number of Pieces | 5 |
| Drill Bit Design | Stepped cone-shaped cutting bits |
| Common Material | High-Speed Steel (HSS) |
| Coating | Titanium nitride on selected models |
| Common Hole Sizes | 4mm to 35mm, depending on kit |
| Cutting Flutes | Straight or spiral, depending on model |
| Shank Type | Hex, round or three-flat |
| Suitable Equipment | Compatible electric drills and drill presses |
| Main Materials | Thin steel, aluminium, copper, brass and plastic |
| Main Users | Electricians, plumbers, fabricators and mechanics |
| Storage | Case or holder, depending on package |
The material grade, coating, number of cutting steps and included sizes should be confirmed from the exact product packaging.
Five Different Step Drill Bits in One Set
One of the main benefits of a 5-piece step drill bit set is having different hole sizes available in a single kit.
Instead of buying a separate twist drill bit for every hole diameter, users can select the appropriate step and drill to the required size.
For example, the TOTAL TACSD2051 five-piece step drill set contains the following sizes:
| Drill Bit | Cutting Range | Step Sizes |
|---|---|---|
| Bit 1 | 4–12mm | 1mm increments |
| Bit 2 | 4–12mm | 2mm increments |
| Bit 3 | 6–18mm | 2mm increments |
| Bit 4 | 4–22mm | 2mm increments |
| Bit 5 | 6–35mm | 6, 8, 10, 13, 16, 19, 21, 23, 26, 29, 31, 33 and 35mm |
This particular TOTAL kit uses HSS 4341 steel and comes in a plastic storage box.
These sizes are an example of a real five-piece set, not a guarantee that every generic kit has the same arrangement.
High-Speed Steel Construction
Many step drill bits are manufactured from High-Speed Steel (HSS).
HSS is commonly used for drilling tools because it can retain useful cutting hardness at the temperatures generated during drilling.
For example, the TOTAL TACSD2051 uses HSS 4341, while other manufacturers use different HSS grades and treatments.
A good HSS step drill bit is suitable for repeated drilling in compatible materials when used with the correct speed and cutting lubricant.
Titanium-Coated Cutting Surface
Some five-piece step drill bit sets feature a titanium nitride coating, commonly identified by a gold-coloured finish.
This coating can help reduce friction and wear during drilling.
However, not every gold-coloured bit has the same coating quality, and a titanium coating does not mean the entire drill bit is made from titanium.
The coating cannot compensate for excessive drilling speed, poor lubrication or use on unsuitable materials.
Multi-Step Cone Design
Unlike an ordinary twist drill bit, a step drill has several cutting diameters along one tapered body.
The smallest cutting step starts the hole. As the drill moves deeper into the material, each larger step widens the opening.
This design is especially useful when preparing holes for cable glands, electrical fittings, bolts and other components in thin sheet materials.
The operator can stop drilling once the desired diameter has been reached.
Dual-Flute and Spiral Cutting Options
Step drill bits are available with straight flutes and spiral flutes.
The flutes help remove metal chips from the hole during drilling.
Some professional step drill sets use two cutting flutes for smoother drilling and chip clearance.
For example, NEIKO’s five-piece metric step drill set uses a two-flute design and a 135-degree split-point tip.
The exact cutting geometry varies by manufacturer.
Applications of 5 Pieces Step Drill Bits in Kenya
Electrical Installation
Electricians can use step drill bits to enlarge holes in suitable metal electrical enclosures, distribution boxes and panels.
The bits are useful for preparing openings for cable glands and conduit fittings.
Before drilling an electrical enclosure, disconnect and isolate all power sources.
Metal Fabrication
Metal fabricators use step drill bits to prepare holes in thin metal sheets, aluminium panels and light-gauge steel.
The tool is useful for creating different hole diameters during custom fabrication work.
Plumbing Installation
Plumbers can use step drill bits to make holes in compatible sheet materials and plastic components for selected pipe fittings.
They are especially helpful when working with thin panels or mounting plates.
Automotive Repairs
Mechanics can use the bits to enlarge existing holes in suitable metal brackets, vehicle accessories and thin sheet-metal components.
Do not drill structural vehicle parts or safety-critical components without an approved repair procedure.
DIY and Home Maintenance
The set is also useful for general home repairs, cabinet work, plastic fabrication and light construction projects.
Step Drill Bits Price in Kenya 2026
The price of a 5 pieces step drill bits set in Kenya depends on the brand, steel grade, coating, included sizes and storage case.
The following are advertised online reference prices.
| Product | Advertised Price |
|---|---|
| Generic 5-piece HSS titanium step drill set | KSh 3,497 |
| Generic heavy-duty 5-piece HSS set | KSh 3,687 |
| TOTAL 5-piece step drill set, TACSD2051 | KSh 3,999 |
| TOTAL 5-piece step drill set, TACSD2051 | KSh 4,350 |
Prices from Jumia Kenya, Wings Suppliers and Wima Power Tools. They are not confirmed selling prices for Peter Machines and Spares.When comparing prices, check whether the set contains five actual step drill bits or a combination of step bits and other accessories.
Benefits of a 5 Pieces Step Drill Bits Set
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Multiple hole sizes: One set provides several cutting diameters.
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Fewer bit changes: Users can enlarge holes without changing drill bits repeatedly.
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Suitable for thin materials: Useful for sheet metal, aluminium and plastic.
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Convenient for electricians: Helps prepare openings for cable glands and fittings.
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Portable: Easy to carry between construction sites and workshops.
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Controlled enlargement: Allows existing holes to be widened gradually.
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Easy storage: Many sets come with a protective case.
Step Drill Bits vs Ordinary Twist Drill Bits
| Feature | Step Drill Bits | Ordinary Twist Drill Bits |
|---|---|---|
| Cutting Sizes | Multiple sizes per bit | Usually one size per bit |
| Best Material | Thin sheets and panels | Thin or thick materials, depending on bit |
| Enlarging Holes | Very suitable | Less convenient |
| Deep Drilling | Not recommended | Suitable with correct bit |
| Electrical Panels | Very useful | Suitable for smaller holes |
| Hole Finishing | Can help reduce burrs | May need separate deburring |
Step drill bits are particularly useful for sheet-metal work. They are not a replacement for twist drill bits when drilling deep holes or thick steel plates.
How to Use 5 Pieces Step Drill Bits
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Select the correct bit. Check the hole diameter required and choose a bit with the appropriate step.
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Mark the drilling point. Use a centre punch where suitable to help prevent the bit from wandering.
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Secure the workpiece. Clamp the material firmly instead of holding it by hand.
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Set the drilling speed. Use a suitable speed for the bit diameter and material. Larger diameters generally need lower speeds.
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Start drilling. Hold the drill at approximately 90 degrees to the workpiece.
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Enlarge the hole. Continue drilling until the desired cutting step passes through the material.
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Stop at the required diameter. Avoid pushing into the next step unnecessarily.
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Finish the hole. Remove burrs and clean the workpiece before installation.
For metal drilling, use a suitable cutting fluid when recommended by the manufacturer.
Recommended Materials for Step Drill Bits
| Material | Suitability | Recommendation |
|---|---|---|
| Aluminium sheets | Very suitable | Use appropriate speed |
| Mild steel sheets | Suitable | Use cutting fluid |
| Copper sheets | Suitable | Clamp securely |
| Brass sheets | Suitable | Apply controlled pressure |
| Plastic sheets | Suitable | Avoid excessive heat |
| Thin wood panels | Suitable for selected bits | Support the material |
| Stainless steel | Model dependent | Use specifically rated bits |
| Thick steel plates | Generally unsuitable | Use an appropriate metal drill or hole cutter |
| Concrete | Not suitable | Use masonry drill bits |
Some generic five-piece sets are explicitly described as unsuitable for stainless steel, so check the exact product rating before use.
How to Choose the Best Step Drill Bits Set in Kenya
Check the Cutting Sizes
Choose a set that covers the hole diameters you regularly use.
For electrical installation, a set with larger steps may be useful for preparing cable gland openings.
For general workshop work, smaller increments provide more size options.
Check the Steel Material
Choose a suitable HSS grade from a manufacturer that provides clear specifications.
HSS 4341 is used in the TOTAL five-piece set, while other products may use different steel grades.
Choose the Right Shank
The shank must fit the drill chuck correctly.
Some sets use 1/4-inch hex shanks, while larger bits may use a different shank size.
Check compatibility before purchasing.
Consider the Cutting Flutes
Spiral-flute designs can help remove chips during drilling.
However, cutting performance also depends on bit quality, material, speed and lubrication.
Confirm the Package Contents
A complete five-piece set should contain the advertised drill bits.
Some kits also include a centre punch, storage case or other accessories.
Maintenance Tips for Step Drill Bits
Clean the bits after use to remove metal chips and dirt.
Apply suitable cutting lubricant during metal drilling where recommended.
Avoid excessive speed, especially when using larger cutting diameters.
Do not force the drill through thick material.
Inspect the cutting edges regularly and replace damaged or blunt bits.
Store the bits in a dry case to prevent rust and accidental damage.
Always wear safety glasses during drilling. Keep loose clothing and hands away from rotating tools.
Where to Buy 5 Pieces Step Drill Bits in Kenya
Customers looking for 5 pieces step drill bits in Nairobi can enquire with Peter Machines and Spares about available drilling accessories, HSS drill bits and workshop tools.
Confirm the brand, cutting sizes, shank type, current price and availability before ordering.
Frequently Asked Questions
What is a 5 pieces step drill bits set?
It is a set of five stepped drilling bits designed to create several hole diameters in thin materials without changing bits for every size.
What materials can step drill bits cut?
Suitable bits can drill thin steel, aluminium, copper, brass, plastic and selected wood materials.
What sizes are available in a five-piece set?
Sizes vary by manufacturer. For example, the TOTAL TACSD2051 includes five bits covering selected diameters from 4mm to 35mm.
Can step drill bits drill stainless steel?
Some specialist bits can drill suitable stainless steel sheets. However, many ordinary HSS step drill sets are not rated for stainless steel.
Can I use step drill bits with an electric drill?
Yes. They can be used with compatible electric drills and drill presses. Check the shank size and manufacturer instructions.
Are step drill bits suitable for thick metal?
Generally, no. They work best on thin sheet materials. Thick metal usually requires a different drilling tool.
What is the price of 5 pieces step drill bits in Kenya?
Advertised examples range from approximately KSh 3,497 to KSh 4,350, depending on brand and specifications.
What is the difference between HSS and titanium-coated step drill bits?
HSS describes the base steel material. Titanium nitride is a surface coating that can help reduce friction and wear.
Can step drill bits enlarge existing holes?
Yes. They are particularly useful for enlarging existing holes in suitable thin materials.
Where can I buy 5 pieces step drill bits in Nairobi?
You can enquire with Peter Machines and Spares about available five-piece step drill bit sets and other drilling accessories, with countrywide supply options.
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