Milwaukee 1-1/8" x 17" x 22" Spline 4-Cutter Rotary Hammer Drill Bit 48-20-4390

HEAVY-DUTY REBAR PENETRATION

For the fleet manager focused on minimizing downtime and maximizing asset ROI, the Milwaukee 48-20-4390 Spline 4-Cutter Rotary Hammer Bit represents the gold standard in heavy-duty masonry drilling. Engineered to withstand the relentless impact of spline-drive hammers, this bit features a precision-ground 4-cutter head that ensures holes remain perfectly round—critical for high-integrity anchor sets. The robust design mitigates the risk of lock-up when striking rebar, a common point of failure that can lead to motor burnout and jobsite delays.

• / SYMMETRIC 4-CUTTER GEOMETRY: Prevents the bit from binding or wandering when encountering embedded steel reinforcement.
• / REBAR PROTECTION CHAMFERS: Reinforced carbide tips act as a shield to prevent shattering during high-impact strikes.
• / ENHANCED DEBRIS CHANNELS: High-volume flute design accelerates the removal of dust and aggregate, keeping the bit cool.
• / SPLINE SHANK INTEGRITY: Optimized for maximum torque transmission in legacy high-power rotary hammers.

WHAT'S IN THE BOX

(1) 1-1/8 in. x 17 in. x 22 in. Spline 4-Cutter Rotary Hammer Drill Bit (48-20-4390)