SOLID TYPE; HEAT TREATED MATERIAL; 1-3/8 INCH MAX. BORE DIAMETER; 1.375 MAX. BORE DIAMETER - DECIMAL; 1-3/8 MAX. BORE DIAMETER - FRACTIONAL; HEX SHANK TYPE; ITEMS/FEATURES MIRCO GROOVE EDGE FOR CLEAN FAST BORING, QUICK CHANGE; USED ON ELECTRIC DRILL