IEY1474 Features: * Fits all cordless screwdrivers and drills, variable speed drills and screw guns * Fast countersinking and counter boring in one operation * Drills clean pilot holes in wood, plastic and composition board * Replaceable drill bit * Carded Specifications: * 4 piece set for No. 6, No. 8, No. 10 and no. 12 wood screws Dimensions: * 1/4"" hex shank