Features:Available in electric grinder， nail machine， engraving machine.Allows Connecting rod power tools to use conventional drill bits.Instantly convert impact driver to hold non-quick change drill & driver bits.Specification:Ideal for :Electric grinder screwdriverType:Chuck Drill Bit AdapterMaterial:Aluminum alloyDrill Chuck Dia:0.3-3.4mmConnecting Rod Dia:3mmHow to use : First 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.Caution : Once installed on this universal chuck. Please do not direct adjusted to high-speed operation， or may cause the rear axle bend.Package Included��1 x 0.3-3.4mm Drill Chuck1 x Connecting Rod