ITEM NAME:0.3-3.4mm 3mm Shank Electric Grinder Keyless Drill Chuck for Rotary Tool JR.Suitable for installing in electric grinder, nail machine, engraving machine, etc. Available in electric grinder, nail machine, engraving machine. 1 x Keyless Drill Chuck. The drill can be speed up by adopting this chuck and only by hands, it is also can play the role of adapter converter.