nut washer: 1) Standard: GB/T3632-1995 version 2) Length: 40 ~ 180mm 3) Dia.: 16, 20, 22, 24mm nut washer:1) Standard: GB/T3632-1995 version2) Length: 40 ~ 180mm3) Dia.: 16, 20, 22, 24mm4) Grade: 4.8S, 5.8S, 8.8S, 10.9S, 12.9SInner packing: nylon knitted bagsOuter packing: cartons (six layers)