... A2,A4 Finish:Black Oxide,Zinc,Dacromet E rings DIN6799Material:Carbon Steel,stainless steel1) Various kinds of ... washers are available2) Can be made with different tensile strength, such as A2,A43) Can ... be supplied with different finish, such as bright, zinc plated, ... black4) Can be made with different standards, sch as ISO, DIN, ANSI, BS ...