... , Cross recess type, H drive, Hexagon socket, Square socket, Torx, Triangle drive, Indented hexagon and etc ... black oxide, zinc electroplating, phosphate, copper plating, mechanical galvanization, hot dip galvanization, etc. Descripion Item nameStainless steel bolt ... cutting,CNC Punching,CNC Bending,Welding,Assembling,ect.Surface treatmentPowder coating, Hot galvanized, Painting, Polishing, Brushing ...