Milwaukee 48-89-9204 — #4 Step Drill Bit (3/16"–7/8")
The Milwaukee 48-89-9204 is a #4 step drill bit, designed to drill multiple hole sizes (3/16" up to 7/8") using a single bit. It’s mainly used for sheet metal, electrical panels, HVAC work, and fabrication where you need clean, precise holes in thin materials.
This is part of Milwaukee’s “JAM-FREE Performance” step bit line, which is built for fast cordless drilling.
What it does
Instead of switching drill bits, this one steps through sizes in 1/16" increments:
- 3/16"
- 1/4"
- 5/16"
- 3/8"
- 7/16"
- 1/2"
- 9/16"
- 5/8"
- 11/16"
- 3/4"
- 13/16"
- 7/8"
That’s 12 hole sizes in one tool.
Key Features
-
Dual-flute design (JAM-FREE) – smoother cutting, less grabbing in metal
-
Rapid Strike tip – helps start holes cleanly without walking
-
Black oxide coating – reduces heat and improves durability
-
Laser-etched size markings – lets you stop exactly at the hole size you want
-
3-flat shank (Secure-Grip) – prevents slipping in the drill chuck
- Optimized for cordless drills at high speed
Best Uses
- Electrical panel knockouts
- HVAC sheet metal duct work
- Steel and aluminum sheet fabrication
- Plastic enclosures
- Enlarging or stepping existing holes cleanly
Important limitations
Step bits like this are great for:
- Thin steel
- Aluminum
- Plastic
But not ideal for:
- Thick plate steel
- Deep holes
- Heavy structural drilling
They’re really a sheet-metal finishing tool, not a structural drilling bit.
