SDS Chuck Capacity Range: 2-13mm (1 / 16-1 / 2 inch); Mounting Thread: 1 / 2-20UNF Keyless chuck tightens with fingers for quick and easy bit change. SDS Quick Change Shank for Electric Hammer Unique torque thrust bearing is easy to handle applied and translates into clamping force, effectively preventing bits from loosing, more reliable Suitable for the power of 1050W above the drill, multiply the utility of cordless screwdrivers and wrenches to do the work of normal electric drill, Weight: 0.65477291814 pounds, Manufacturer: Rtxbvg