... Finish:Passivated,Black Oxide,Zinc,Dacromet etc Hexagon flange bolts DIN6921Material:Stainless Steel,Carbon Steel1) Various ... of bolts are are available2) Can be made with different tensile strength, such as 8.8S3) ... Can be supplied with different finish, such as bright, zinc plated, ... black4) Can be made with different standards, such as ISO, DIN, ANSI, ...