# THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set

Piece: The THINKWORK W6139-HSS step drill bit set is listed as five HSS bits with four spiral flutes and TiN coating. Its stated ranges cover several stepped hole sizes, but the listing gives conflicting kit details, so confirm the exact bits and case before ordering.

- [Original product page](https://best-deals.pro/product/thinkwork-w6139-hss-step-drill-bit-set)
- [View offer](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- Market: US
- Language: en-US
- Currency: USD
- Brand: THINKWORK
- Model: W6139-HSS Step Drill Bits
- Category: Tools & Garden > Power Tools > Drills & Drivers
- Price: 27.99 USD
- Previous price: 31.97 USD
- Discount: 12%
- Price checked: 2026-11-13T05:37:40.871Z
- Rating: 4.4 / 5
- Reviews: 612

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Four-flute spiral design and laser-marked step sizes are presented for controlled hole enlargement and size selection.
- The manufacturer lists five bit ranges from 1/8" to 1-3/8" overall, with a different number of steps on each bit.
- The listing describes use on thin metal and wood, and also names aluminum, copper, iron, carbon steel and plastic.

## Pros

- Five stated size ranges cover a variety of hole diameters, including a bit reaching 1-3/8".
- Laser-marked sizes are intended to make step selection easier while working.
- HSS construction and a TiN finish are specified.

## Specifications

### Identity
- Brand: THINKWORK
- Model: W6139-HSS Step Drill Bits
### Dimensions and installation
- Dimensions listed: 6 x 1.5 x 4 inches
- Shank type: Straight
### Materials and protection
- Material listed: High Speed Steel \(HSS\)
- Finish: Titanium Nitride
### Cutting design and applications
- Cutting diameter: 1.38 inches
- Minimum bore diameter: 4.76 millimeters
- Flute type: Spiral
- Number of flutes: 4
- Point style: Step Point
- Surface recommendation: Metal, Wood, Plastic

## Before you buy

- The listing conflicts on kit details: its title says 59 steps, the five individual ranges add up to 59 steps, but another item highlight claims sizes from 1/8" to 1-3/8" without explaining the count. Shank descriptions also vary between a straight shank and 1/4" plus 3/8" shanks. The case is claimed in feature copy but absent from the explicit contents list. Confirm the selected listing's exact sizes, shanks and case before buying.

## In the box

- 5 step drill bits (Included)
- Storage case (Check selected pack): Feature copy claims a case, but the explicit contents list names only five step drills.

## A good fit for

- DIYers or maintenance users enlarging holes in thin sheet metal, wood or plastic who want multiple step ranges in one kit.
- Buyers who prefer size markings on the bits to identify the intended hole diameter.

## Less suited to

- Buyers who need a confirmed case or a particular shank size without first checking the selected listing.
- Users who need dependable performance for demanding or repeated work, given customer reports of dulling and breakage.

## Customer feedback

Customer feedback is generally positive about quality, functionality and cutting performance, including reported use in steel, aluminum and hard metal. Feedback on sharpness is mixed, with some finding the bits sharp and others reporting quick dulling. Durability is a notable concern, including reports of breakage at the second step. For buyers considering the listed HSS, four-flute set for metal or other stated materials, those reports make workload and expected service life important trade-offs.
- Positive themes: Customers report good functionality and cutting performance.
- Positive themes: Some customers describe the bits as sharp and report use in steel, aluminum and hard metal.
- Positive themes: Customers express positive views about quality and value.
- Negative themes: Customers report durability concerns, including breakage at the second step.
- Mixed feedback: Sharpness feedback is mixed, with reports of both sharp cutting and quick dulling.
- Mixed feedback: Material compatibility is not uniformly reported.

## Frequently asked questions

### How many bits and step sizes are claimed?
The feature description claims five bits with ranges of 3/16"-1/2" \(6 steps\), 1/8"-1/2" \(13 steps\), 1/4"-3/4" \(9 steps\), 3/16"-7/8" \(12 steps\), and 3/16"-1-3/8" \(19 steps\). Together these total 59 steps, while other listing details are inconsistent, so check the selected listing.
### What materials does the listing recommend?
The surface recommendation names metal, wood and plastic. Feature copy also names aluminum, copper, iron and carbon steel, and describes drilling thin sheet metal and wood.
### Is a storage case included?
The feature description claims a blow-molded case, but the explicit contents list only says “step drill 5pcs.” Case inclusion is therefore uncertain. Confirm the selected listing.
### Are the shanks 1/4 inch or 3/8 inch?
The listing is inconsistent: it specifies a straight shank in one detail field and claims 1/4" plus 3/8" shanks in another. Check the listing for the exact shank configuration.

## Alternative options

- [Keovoker 4 Spiral Flute Step Drill Bit Set with Case for Sheet Metal, Wood \| 5PCS, 1/8"-1-3/8" HSS Unibits, 1/4" and 3/8" Quick-Change Hex Shank, Use in Electrical Installation, DIY Repair](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [Matework 4 Spiral Flute Step Drill Bit Set, M35 Cobalt Unibit 3Pcs \| Step Drill Bit](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [Rocaris 5 Pack Step Drill Bit & 5 Pack Countersink Drill Bit Set with Case \| 50 Sizes of Step Bit for Metal, Aluminum Case, Multiple Hole Stepped Up Bits for DIY](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [5 Piece Unibit Step Drill Bit for Metal, HSS Step Bit Set, 1/8"-1-3/8" \| Four Spiral Flute, Bright Ground & Nitrided Finish, 59 Sizes, 1/4" & 3/8" Hex Shank, for Metal, Wood, Plastic, Storage Case](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [ZELCAN 5PCS Titanium HSS Step Drill Bit Set, 50 Sizes, 1/8" to 1-3/8" \| 5PCS 50 Sizes 1/8" to 1-3/8"](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [HIGHFIRE 29 Pieces HSS Stepped Point Drill Bit Set 1/16"-1/2", Gold and Black 3-Flat Shank for Metal, Steel & Acrylic - No Pilot Hole Needed - Industrial, MRO & DIY Use](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [IRONANT 5PCS Spiral Flute Titanium HSS Step Drill Bit Set for Metal Unibit \| 50 Sizes Spiral Grooved High Speed Steel TiAlN Step Bits with Aluminum Case for Sheet Metal, Aluminum, Iron and Plastic](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [M2 Step Drill Bit Set, 1/8~1-3/8" 5Pcs 4 Spiral Flute AlTiN Coated Step Bit \| Versatile Size,Upgraded 3/8" Shank for Higher Torque,1/4" Hex Shank,for Soft Metal, Sheet Iron, Aluminum, Wood, Plastic](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [Auger Drill Bit for Planting Set of 4, Garden Ground Earth Spiral Drill Bit for 3/8...](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [THINKWORK 10Pcs Step Drill Bit & Countersink Set, HSS Four Spiral Flute \| TiN Coating, Precise Scale Marks,5 Step Bit+5 Countersink Bit, Smooth Drilling, Long Lifespan, Storage Case,1/4" +3/8"Shank](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [Step Bits for Metal, Step Drill Bit Set 5PCS Titanium, Spiral Grooved with Automati...](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [COMOWARE Step Drill Bit Set for Metal HSS 5Pcs Ti-Coated with Center Punch \| Step Bit with 2 Flutes,Tri-Shank, Unibit from \(3/16" to 1-3/8"\) 50 Sizes, for Steel/Wood/Plastic, with Aluminum Case](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)

## Add-ons

- [Tap Magic 30004P ProTap Cutting Fluid, 4 oz. Size](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)
- [6 Packs Combination Drill & Taps Bit Set, Screw Tapping in SAE Size 6-32nc 8-32nc 10-32nc 10-24nc 12-24nc 1/4-20nc with Anti-Rust Black Coating, 1/4” Hex Shank and Storage Case](https://best-deals.pro/visit/thinkwork-w6139-hss-step-drill-bit-set)

## Images

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 1](https://best-deals.pro/i/KvugpNhdvnphRTpbZnQs3PJ8gYpfcGr4zFP3Dww5qoi0Jx3q_uHWFl8avkxHVtgYPMGkeKFi2YFkMZzOlTSRVrjFpFiwUMGf0_N1DcIw8cc7UMOxG9-W.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 2](https://best-deals.pro/i/h7X2RBS298dYkz_KLmqGzAoU8-SwqWGfaA6tqpRQK8CTIvRU9qOK8wcKJ5iYW3Jqvd_J6MFZXJ4PG9e1bZ3MIOFK4GscrcKlUfi3zETzcTnx1GoId1cg.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 3](https://best-deals.pro/i/H5EyD8Rr7poAnB1ZkTAJRrHfrRXIcPWah0IHuXMTbSOUW-m8IHjK3ABudoc10dmFo6MNx_dbTLue2k6ZcNPOHwIAlTAHLweFTYE1QLGyk6u6h75NKi5r.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 4](https://best-deals.pro/i/opborwO8WnJ_eiQeUcGFNDdPb7BERgjrE_A9MsuF3flu2CR_wvF9DFOaFGnp7TiK7NgFb-L1MxpsDYC2E2hGWdvC0Qxaf9Pu4UnTnZTPZqm9JbHQctoR.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 5](https://best-deals.pro/i/OOoYIe8g_DTU9f3_cENVOzoVZ3939MkODEeCGmo7Sy3ODwXcYZu0y93gcfPpW0jP0bVjKmz5Gp1N1tXOBzpEcxYPiX3Db0Y0cpNiD2HWAKFwVQJAGl_j.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 6](https://best-deals.pro/i/PO5XAtfyuYk2FD6ljh32rBVcfRsopDXp8JvYZt0DpPBsJyiJI8pkiBcIS4JNzOoLhch8tz5_LmCWhFbdL_oerAVSfKerjDLgRgLbNEnlYEjM8JUiWjhd.jpg)

![THINKWORK W6139-HSS 5-Piece HSS Step Drill Bit Set — 7](https://best-deals.pro/i/ETpTbGGVfYRfn2nd392LhQv560zUetelaOFN3n1auay9lF4N4oAMb8CyWPqv5fFYxopK2lwb1SjfAuW12XfnYWZj9Y5nJipuf9cb-JPO9cnnCwRpyNB8.jpg)