Makita HR2475 1" Rotary Hammer Powerful 7.0 AMP motor delivers 0-1,100 RPM &amp; 0-4,500 BPM for the most demanding applications Torque limiting clutch engineered to prevent gear damage by automatically disengaging gears if the bit binds Sequential impact timing delivers timed hammering during rotation to minimize overlapping bit impacts resulting in up to 50% faster drilling Makita Motor Advantage engineered with field core interlocking steel laminations, dual ball bearing armature and more copper commutator bars, increasing energy transfer efficiency for more power and longer tool life Extended life brushes are longer for more work between service intervals and less downtime