FRACTIONAL, SELF-STARTING TYPE; HIGH SPEED STEEL MATERIAL; 1/8 INCH MIN. DRILL SIZE; 1/2 INCH MAX. DRILL SIZE; HEX SHANK TYPE; 1/4 INCH SHANK SIZE; 13 SIZE(S); 1/32 INCH STEP INCREMENT; NOMINAL SIZE #1; MAXIMUM MATERIAL THICKNESS 1/8 INCH