FRACTIONAL, HOLE ENLARGING TYPE; HIGH SPEED STEEL MATERIAL; 13/16 INCH MIN. DRILL SIZE; 1-3/8 INCH MAX. DRILL SIZE; HEX SHANK TYPE; 7/16 INCH SHANK SIZE; 10 SIZE(S); NOMINAL SIZE #21; MAXIMUM MATERIAL THICKNESS 1/8 INCH; NUMBER OF FLUTE SINGLE