Milwaukee
Milwaukee Tool Cobalt Step Bit Kit (3PC)
- SKU:
- MLW48-89-9291
- Availability:
- Usually Ships Same Day
- Weight:
- 1.31 LBS
Description

DUTY®
Cobalt Step Bits
3-Bit Set
Keep 1/8–1-1/8 in step-drilling coverage together for changing hole requirements.
Product Overview
Match the bit and marked step to the required hole. The FAQ lists the exact included sizes.
Cobalt geometry suits stainless and mild steel sheet, within the specified 14-gauge limit.
- Useful coverage1/8–1-1/8 in hole selection.
- Visible sizingEtched stop references.
- Stepped cuttingEnlarge holes without bit swaps.
- Metal drillingCobalt design for steel sheet.
Technical Specifications
- Size coverage
- 1/8–1-1/8 in
- Tip
- Rapid Strike
- Flutes
- Elongated dual
- Shank
- 3-flat Secure-Grip
- Sheet limit
- 14 gauge
- Work metals
- Stainless / mild steel
Choose the Correct Fit
Check the included bit sizes against the job before ordering. A range does not imply every possible intermediate diameter.
Use low speed in stainless and high speed in mild steel; keep within the recommended 14-gauge thickness.
Installation & Care
Stop advancing at the selected step. The larger diameter above it will enlarge the opening if fed into the work.
Let the bits cool, remove chips safely and store them with the cutting edges protected.
Small Details. Big Jobsite Energy.
Get set. Stay focused. Make your next move count.
THE NEXT JOB.
Ask Willy:
Need help choosing the assortment? Tell Willy the required openings, material and sheet thickness.
Important Product Questions
Which bits are included?
The set includes #1 (1/8–1/2 in), #4 (3/16–7/8 in) and #9 (7/8 and 1-1/8 in) cobalt step bits, plus a carrying case.
Can I substitute a nearby marked size?
Use the diameter specified for the fitting or fastener. Adjacent steps produce different clearances, so compare the actual sizes before drilling.
How should I choose the drilling speed?
For this cobalt set, Milwaukee specifies low speed in stainless steel and high speed in mild steel.