... , hanger bolts, etc ), kinds of screws( self-drilling screws, lag screws, chipboard screws, drywall screws, wood screws, etc.), kinds of nuts( hexagon nuts ... Our main material is iron steel, stainless steel, brass, and aluminums. We also produce Non-standard. ... zinc plated, black phosphatization finishing, grey phosphatization finishing, brass plated, nickel plating, hot dipping, machinery zinc plated, ...