Which materials is this step drill bit suitable for?

This cobalt step drill bit is engineered for steel, non-ferrous metals, and stainless steel.

What hole sizes can you drill with this bit?

It drills steps of 4, 6, 8, 10, 12, 14, 16, 18, 19, and 20 mm.

What is the benefit of the AlCrN coating?

The coating delivers up to 10x longer tool life and reduces friction and heat build-up.

Do you need to pilot drill before using this bit?

No, the centering tip starts accurately on contact without walking or pre-drilling.

What shank design does this Milwaukee step drill have?

It features an 8 mm 3-flat shank that prevents slipping inside the drill chuck.

MILWAUKEE 48899372 step drill Cobalt AlCrN 4-20 mm

Name: MILWAUKEE 48899372 step drill Cobalt AlCrN 4-20 mm
Brand: MILWAUKEE
SKU: 08088074
Price: 77.8 EUR
Availability: PreOrder

Supplier number: MILWAUKEE 48899372 | EAN 0045242603862

Recommended Retail Price €155.42

77.80 tax incl.

€64.30 excl. VAT (incl. all environmental contributions)

On order: delivered from 26/11/2026

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Delivery by DHL

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Fast drilling with Milwaukee

Practical benefits

Superior resistance to heat: Engineered with cobalt steel and an AlCrN coating, it lets you drill through stainless steel without overheating.
Accurate starts without walking: The specialized tip geometry engages immediately on metal surfaces so you avoid pre-drilling and unwanted slipping.
Secure non-slip chuck grip: Featuring a 3-flat shank design, this accessory prevents slippage inside the tool chuck during heavy drilling tasks.

In a nutshell

The right choise for

With the Milwaukee 48899372 step drill bit, you can drill and deburr clean holes from 4 to 20 mm in sheet metal, control panels, and tough stainless steel. You eliminate the hassle of swapping standard bits, smoothly stepping through 10 hole sizes with one tool. Built from cobalt steel with a heat-resistant AlCrN coating, it reduces friction and delivers up to 10x longer tool life in challenging metals. The dedicated centering tip starts immediately on contact without walking or pre-drilling on slick surfaces. Fitted with an 8 mm 3-flat shank, this bit stays firmly locked in your chuck for maximum torque transfer and complete drilling control.

Product information FAQ

€77.80

tax incl.

Key features according to our expert

Smallest diameter: 4 mm
Largest diameter: 20 mm

Product description

New Aluminium Chromium Nitride (AlCrN) coating for 10x more life vs. MILWAUKEE standard step drill.
For steel and stainless steel.
RAPID STRIKE TIP: Accurate start without walking and fast drilling without the need to pre-drill the material.
Special tip and step geometry for jam-free performance - less risk of drill snagging when used with cordless tools and also prevents deformation of the drilled material.
Optimised 2 flute ground sharpened edge geometry for 2 x faster and smoother cutting.
With 3 flat secure grip to prevent step drill from slipping in the chuck and ensure maximum transmission of torque.
Laser engraved size markings for best long term visibility.

All Features

Smallest diameter: 4 mm
Largest diameter: 20 mm
Number of steps: 10
Overall length (mm): 62
Shaft diameter (mm): 8

Brand MILWAUKEE
08088074
EAN 0045242603862
Supplier number MILWAUKEE 48899372

Frequently asked questions about this product

Answered by specialists

Which materials is this step drill bit suitable for?: This cobalt step drill bit is engineered for steel, non-ferrous metals, and stainless steel.
What hole sizes can you drill with this bit?: It drills steps of 4, 6, 8, 10, 12, 14, 16, 18, 19, and 20 mm.
What is the benefit of the AlCrN coating?: The coating delivers up to 10x longer tool life and reduces friction and heat build-up.
Do you need to pilot drill before using this bit?: No, the centering tip starts accurately on contact without walking or pre-drilling.
What shank design does this Milwaukee step drill have?: It features an 8 mm 3-flat shank that prevents slipping inside the drill chuck.