Diameter.: 5MM--20MM (1/4"---3") Grade: 6/8/10/12 Surface: Zinc Plated, BLACK, PLAIN, YZP, HDG Standard: DIN, ANSI, UNI, JIS Product details:Diameter.: 5MM--20MM (1/4"---3")Grade: 6/8/10/12Surface: Zinc Plated, BLACK, PLAIN, YZP, HDGStandard: DIN, ANSI, UNI, JIS, ISOincl.DIN6923Packing: bulk or small box packed in cartons, then in pallets.