FRACTIONAL, SELF-STARTING TYPE; HIGH SPEED STEEL MATERIAL; 3/16 INCH MIN. DRILL SIZE; 1/2 INCH MAX. DRILL SIZE; HEX SHANK TYPE; 1/4 INCH SHANK SIZE; 6 SIZE(S); 1/16 INCH STEP INCREMENT; NOMINAL SIZE #2; MAXIMUM MATERIAL THICKNESS 3/8 INCH