7/16 INCH WIDTH ACROSS FLAT; 1 INCH MIN. HOLE SAW SIZE; 1 MIN. HOLE SAW SIZE - DECIMAL; 1 MIN. HOLE SAW SIZE - FRACTIONAL; 20 TPI; 1/2 INCH THREAD SIZE; HEX SHANK SHAPE; DOUGLAS. BRAND; FOR HOLE SAW D2V-12, D2V-24; FOR HIGH SPEED DRILL