SHOCKWAVE™ Impact Duty™ #9 7/8" & 1-1/8"

The Milwaukee 48-89-9249 is a #9 SHOCKWAVE™ Impact Duty step drill bit, designed for large-diameter holes (7/8" and 1-1/8") in sheet metal using an impact driver or drill.

Hole sizes

• 7/8"
• 1-1/8"

This is a 2-step large-hole bit, not a full multi-step ladder. It’s meant for specific conduit and knockout sizes, not general stepping.

Key Features

• SHOCKWAVE™ Impact Duty design – optimized for impact drivers (also works in drills)
• TiAlN coating (Titanium Aluminum Nitride) – up to 5× longer life
• Rapid Strike™ tip – fast starts with minimal walking
• Dual spiral flutes – up to 2× faster hole cutting
• SHOCKZONE™ shank – reduces breakage under high torque
• Laser-etched markings – clearly shows the 2 stop sizes

Best Uses

• Electrical conduit holes (especially larger sizes)
• Panel knockouts
• HVAC duct and sheet metal fabrication
• Enlarging existing large holes
• Thin steel, aluminum, plastic

Important limitation

Like all step bits:

• Best for thin material (sheet metal)
• Not for thick plate or structural drilling
• Not for deep holes

How it fits your lineup

• 9241 (#1): 1/8"–1/2" (small)
• 9243 (#3): 3/16"–3/4" (mid-range)
• 9244 (#4): 3/16"–7/8" (extended range)
• 9249 (#9): 7/8" & 1-1/8" (this — large knockout sizes)