Makita HR4041C 1-9/16-Inch Rotary Hammer Spline Powerful 12.0 AMP Motor delivers 230-460 RPM and 1,300-2,600 BPM for the most demanding applications Constant speed control automatically applies additional power to the motor to maintain speed under load to complete the most challenging jobs Soft start suppresses start-up reaction for more control and better accuracy Variable speed control dial enables user to match the speed to the application for greater versatility 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 Automatic brush cut-off protects commutator from damage for longer tool life 2-mode operation for ""Hammering Only"" or ""Hammering with Rotation"" for multiple applications ""No hammering when idling"" function helps increase tool life High quality aluminum housing allows for greater durability and longer tool life Accepts Spline bits Side Handle (416549-4) Depth Gauge (321248-4) Tool Case HR4013C HR2621 HR2611F HR2811FX HR2475X2 HR2475 HR4510C HR3210C HR2811F HR2470F HR4002 HR5210C HR1830F HR4001C HR4010C HR2432 HR5000 Powerful 12 amp motor; 230-460 RPM for the most demanding jobs Dual-purpose "hammering only" or "rotation with hammering" modes for multiple applications No hammering while idling helps increase tool life. Torque-limiting clutch Electronic variable-speed control dial enables user to set speed per application