SHOCKWAVE™ Impact Duty™ #4 3/16 - 7/8"

The Milwaukee 48-89-9244 SHOCKWAVE Impact Duty Step Drill Bit is a #4 impact-rated step drill bit, covering 3/16" to 7/8" in one tool. It’s essentially the impact-driver version of the 9204 you listed earlier, but stronger, faster, and longer-lasting.

Hole range

• Minimum: 3/16"
• Maximum: 7/8"
• Steps: ~12 sizes (1/16" increments)

This gives you a wide range for panel work, conduit holes, and fabrication.

Key Features

• SHOCKWAVE™ Impact Duty design – optimized for impact drivers, also works in drills
• TiAlN coating (Titanium Aluminum Nitride) – up to 5× longer life vs standard step bits
• Rapid Strike™ tip – faster starts, less walking
• Dual spiral flutes – up to 2× faster hole cutting
• SHOCKZONE™ shank – reduces breakage under high torque
• Laser-etched markings – precise size control while drilling

Best Uses

• Electrical panel holes (3/16"–7/8")
• HVAC duct and sheet metal work
• Enclosures and control panels
• Enlarging existing holes cleanly
• General fabrication in thin steel, aluminum, and plastic

How it fits your lineup

• 9241 (#1): 1/8"–1/2" (small precision)
• 9243 (#3): 3/16"–3/4" (mid-range)
• 9244 (#4): 3/16"–7/8" (this one — extended mid/large range)
• 9204 (#4 standard): same range, but not impact-rated

👉 So the 9244 is basically the upgraded, impact-rated version of the 9204, with better durability and speed.