The Milwaukee #9 step drill bit produces just 2 large hole sizes -- 7/8" and 1-1/8" -- the standard conduit-knockout diameters for 1/2" and 3/4" rigid and EMT conduit fittings. By limiting the step range to the two most-needed large sizes, the bit stays compact and balanced for clean punch-through in steel electrical enclosures, panels, and junction boxes. 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.

• 2 steps: 7/8" and 1-1/8" -- the standard 1/2" and 3/4" conduit-knockout sizes
• 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 #9 is the dedicated electrical bit for 1/2" and 3/4" conduit work -- two sizes only, no intermediate steps to wade through, and a more compact body than the broad-range #4. Carry it as your conduit bit and run a smaller step bit (#1 or #3) for everything below 3/4".