Milwaukee Tool 48-20-9110 Hammer Drill Bit 1/4 in

Product Description

The MILWAUKEE TOOL 48-20-9110 is a carbide-tipped rotary hammer drill bit designed for percussion drilling into block, brick, and concrete. The 1/4-inch diameter bit features a three-flat shank for secure chuck engagement and a 2-inch flute length that clears debris efficiently during drilling. At 4 inches overall length, it fits standard SDS-adjacent and keyed chucks accepting three-flat shanks. The high-speed steel body provides durability under repeated impact loads, while the carbide tip handles the abrasive demands of masonry work. A single piece per package makes this a practical addition to any masonry drilling setup for trade professionals.

This bit is suited for residential and light commercial applications where drilling into concrete block, brick, or poured concrete is required. Typical install scenarios include anchor-setting work, conduit penetrations, and rough-in drilling performed by electricians, plumbers, and HVAC technicians working through masonry substrates. The percussion cutting geometry is optimized for use with rotary hammer drills operating in hammer-drill mode.

Key Features

• Carbide-tipped percussion cutting edge handles block, brick, and concrete
• Three-flat shank provides positive grip and prevents bit slippage in the chuck
• 2-inch flute length channels debris out of the hole during drilling
• 4-inch overall length suits standard depth requirements for anchor and fastener holes
• High-speed steel body withstands repeated impact stress
• Two-flute design balances debris evacuation and cutting speed

Compatibility

Designed for use with rotary hammer drills and hammer drills that accept a three-flat 1/4-inch shank bit. Suitable for drilling into block, brick, and concrete substrates.

Installation Notes

Installation should be performed by a qualified trade professional familiar with rotary hammer operation. Ensure the drill is set to hammer-drill mode before use on masonry; using rotary-only mode on concrete can damage the bit and overheat the tip. Wear appropriate PPE including eye protection and a dust mask, as percussion drilling generates fine silica-containing dust. Confirm the work area is clear of embedded conduit, rebar, or utilities before drilling.