DISC SPRING WASHERS WITH TEST CERTIFICATE. SIZE FOR M16 BOLT SIZE 16.3 X 31.5 OD X 1.75 THICK SIZE 16.3 X 34 .0 OD X 2.0 THK QTY 10000 PCS EACH SIZE FOR M20 BOLT SIZE 40 OD X 20.5 ID X 2.5 THK QTY 5000 NOS