1) standard: din, ansi/asme, bs, non-standard 2) diameter: 2-42mm 3) material: carbon steel 4) grade:4.8, 6.8, 8.8 5) finish:zinc plated, nickel plated, hot dipped galvanized, black 6) packing:in carton/sack and palletized, generally 25kg per unit Packing:in carton/sack and palletized, generally 25kg per unit