Detailed Product Description Washer:1.Specifications: DIN, ANSI ,BS, such as DIN 125, DIN 9021, DIN 433, DIN 126, DIN 440, DIN1440, DIN 1441, DIN 1052, DIN 7349, DIN 7989, BS 4320, BS 3410, SAE, and USS 2.Size: M1.6-M393.Material: Various of material is available.4.Surface: Zinc plating,black, quenching..5.Good quality and competitive price.6.Delivery is on time...