Keyless chuck finger-tightens for easily and quickly changing drill bits. Quick-change SDS shank for electric hammer torque thrust bearing is easy to handle applied translate into greater clamping force, effectively preventing drill bits loose off, more reliable SDS Drill Chuck Capacity Range: 2-13mm(1/16-1/2 Inch); Mount Thread: 1/2-20UNF Suitable for the power of 1050W above impact drill, Multiply utility of cordless impact drivers and wrenches to do work of regular power drill, Weight: 1.984160358 Pounds, Manufacturer: Reeatel