The Milwaukee #3 step drill bit produces 9 clean hole sizes from 1/4" to 3/4" in 1/16" increments, the workhorse range for electrical box knockouts, conduit fittings, panel cutouts, and grommet holes in thin steel, aluminum, and plastic. The dual-flute geometry chips fast, the Rapid Strike tip self-starts without a punch mark and runs cooler than a single-point bit, and the 3-flat Secure-Grip shank locks into a standard drill chuck without spinning under load.

• 9 steps from 1/4" to 3/4" in 1/16" increments
• Drills sheet steel, aluminum, copper, brass, and plastic up to roughly 1/8" thick
• Dual-flute design clears chips fast and cuts cooler than single-flute step bits
• Rapid Strike tip self-starts and runs cooler, prolonging cutting-edge life
• Laser-engraved size marks on each step for quick identification
• Black oxide coating reduces friction and resists corrosion
• 3-flat Secure-Grip shank locks into standard 3-jaw and quick-change chucks

Application Tip: Step bits are the right tool for thin material -- up to about 1/8" thick. Use the high speed setting on a cordless drill, apply firm steady pressure, and stop drilling the moment the next step's shoulder reaches the workpiece. For sheet metal, a few drops of cutting oil cool the tip and produce a cleaner hole edge.

Selection Tip: The #3 covers the most-used range on the jobsite: 1/2" and 3/4" conduit-knockout sizes hit dead-on, and intermediate sizes step up cleanly for cable-gland fittings, snap-bushings, and switch boxes. This is the single step bit most electricians carry first.