(a) 1 Piece of V10 (10 mm / 3/8″ Full Bullnose) Diamond Brazed. (b) 1 Piece of V13 (13 mm / 1/2″ Full Bullnose) Diamond Brazed. (c) 1 Piece of V20 (20 mm / 3/4″ Full Bullnose) Diamond Brazed. FOR 10MM (3/8″) HIGH OR THICK STONE CONCRETE (5/8″-11 Female Thread arbor ).