EPDM BOND WASHER SIZE: M6-M64 MATERIAL:CARBON STELL SURFACE FINISH:ZINC PLATED,HOT DIP,BLACK,PLAIN ISO,SGS ROSH Desc: EPDM washersize: 12,16,19Surface: yellow/white/brightMaterial: EPDM ,steel/stainless steelcan according to customer's design12,14 (FOR 5.5MM), 16,19,26(FOR 6.3MM) BONDED WASHER . STEEL + EPDM(BLACK OR GREY)