Milwaukee 5426-21 1-3/4-Inch SDS-Max Rotary Hammer The product is easy to use The product is durable The product is manufactured in Czech Republic 8.8 ft/lbs Impact Energy - heavy duty crank piston mechanism delivers hard hitting performance 450 RPM and 2,840 BPM - delivers fast drilling even in the toughest concrete 2 Speed Impact Mode - low reduces speed (350 RPM) and beats per minute (2,200 BPM) for light materials Constant Power Technology - maintains drilling speed and power when the tool is under load. AVS: Anti Vibration System - actively reduces user vibration and increases productivity Mechanical Clutch - protects the gears and provides added control