1/4 INCH WIDTH ACROSS FLAT; 3/4 INCH MIN. HOLE SAW SIZE; .75 MIN. HOLE SAW SIZE - DECIMAL; 3/4 MIN. HOLE SAW SIZE - FRACTIONAL; 20 TPI; 1/2 INCH THREAD SIZE; HEX SHANK SHAPE; DOUGLAS. BRAND; FOR HOLE SAW D2V-12; FOR HIGH SPEED DRILL