... ),1/2"(13mm),5/8"(16mm) 2.keyless,key type drill chuck 3.light,heavy duty 4.packing:color box,blister ... :And the power of the different digs AC&DC electric drill.characteristics:1. The high precision taper thread and hole.2 ... the key input force into larger clamping force, with strong impact resistant ability.3. Special processing, has good abrasion resistance with ...