Power: 220-240V at 50/60Hz Power Input: 1600W Speed Without Load: 550 RPM Impact Speed: 3850 beats per minute Drilling Capacity: 9.0 J Max. Impact Energy: 38 mm concrete; 100 mm core bit The SDS MAX Chuck System is an anti-vibration system that includes two drills and two chisels along with one set of extra carbon brushes that are packed by BMC.