torque thrust bearing is easy to handle applied translate into greater clamping force, effectively preventing drill bits loose off, more reliable Keyless chuck finger-tightens for easily and quickly changing drill bits. Quick-change SDS shank for electric hammer 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: 1.322773572 Pounds, Manufacturer: Reeatel