Convert standard drill bits hex power bits Fits all standard & specialty round shank bits, cobalt bits, brad point bits, & masonry bits Each adapter accepts a range of sizes Standard hex shank fits all power bit quick change chucks Use in metal, wood, or plastic Highlights: Convert standard drill bits hex power bits Fits all standard & specialty round shank bits, cobalt bits, brad point bits, & masonry bits Each adapter accepts a range of sizes Standard hex shank fits all power bit quick change chucks Use in metal, wood, or plastic Size : 1/4