#12 Step Drill Bit, 7/8" - 1-3/8"

Milwaukee 48-89-9212 — Step Drill Bit (#12)

The Milwaukee 48-89-9212 is a #12 step drill bit, designed for large sheet-metal hole cutting in multiple stepped diameters using a single bit, especially with cordless drills at high speed.

It’s one of the largest and most versatile step bits in the Milwaukee lineup, covering a wide range of big hole sizes.

Hole range

This bit typically covers 5 stepped diameters from:

• 7/8"
• 1"
• 1-1/8"
• 1-1/4"
• 1-3/8"

Each step increases in 1/8" increments, letting you stop at exact sizes while drilling.

Key Features

• JAM-FREE dual-flute design – faster cutting and better chip evacuation in metal
• Rapid Strike tip – helps start holes cleanly without walking
• Laser-etched size markings – lets you stop precisely at each step
• Black oxide coating – reduces heat and increases durability
• 3-flat Secure-Grip shank – prevents slipping in drill chucks
• Optimized for cordless high-speed drilling in sheet metal and plastic

Best Uses

• Large electrical panel knockouts
• HVAC duct and sheet metal fabrication
• Big conduit and enclosure holes
• Enlarging or finishing existing holes
• Plastic and thin steel work

Important limitation

This is still a sheet metal tool, not a structural drill:

• Best for thin materials (sheet metal, aluminum, plastic)
• Not designed for thick steel plate or deep hole drilling
• Not a replacement for twist bits or hole saws in heavy steel

How it fits your step-bit lineup

• 9204: small/medium holes
• 9205: mid-large range
• 9208: large holes up to ~1"
• 9209: 2-step big conduit holes
• 9212: full large-range professional step bit (this one)

So the 9212 is basically the “most complete large step bit” in that family.