FRACTIONAL, SELF-STARTING TYPE; HIGH SPEED STEEL MATERIAL; 1/4 INCH MIN. DRILL SIZE; 3/4 INCH MAX. DRILL SIZE; HEX SHANK TYPE; 3/8 INCH SHANK SIZE; 9 SIZE(S); 1/16 INCH STEP INCREMENT; NOMINAL SIZE #3; MAXIMUM MATERIAL THICKNESS 1/8 INCH