... 4.prompt delivery 5.non-standerd parts Item Nodrywall screws Materialsiron,aluminum,steel,copper,plastic,carbon steel,nylon,bronze, ... to your drawingsSurface treatmentheat treatment,polishing,PVD/CVD coating,galvanized,electroplating,spraying,painting and so onBusiness scopeCNC center machining, ... we receive your valued enquiries with detail specification. drywall screws