Mesee 0.3-3.4mm Capacity Mini Keyless Chucks Adapter Conversion Tool- Universal 3mm round shank snaps easily into the power screwdriver.- Three-jaw chuck to securely hold extra-fine round-shank drill bits with 0.3-3.4mm shank.- Instantly convert impact driver to hold non-quick change drill & driver bits, use in automotive, garages, warehouses, offices, home, etc.- Keyless chuck converter to go from driving to drilling in seconds. Allows impact driver to function like regular drill and hold non-quick change drill & driver bits.➤How to use : Firstly governor speed adjustment in the "minimum or zero turn", then turn on the power, adjust the speed, speed not more than 1w, to avoid damage to the shaft.➤Specification:Material: aluminum alloyChuck Height: 18.5mmChuck Diameter: 14mmClamping Range: 0.3-3.4mmConnecting Rod Shank: 3mm Round Shaft➤Package Included:2pc x 3mm Keyless Drill Chuck