Hex socket set screws with black zinc plated 1,Products DetailesMaterial1.Stainless Steel: SS201, SS303, SS304, SS316, ... Painting,Black Anodize,Plain,Chrome plated,Hot Deep Galvanize(H. D. G. ) etc.Heat TreatmentTempering,Hardening,Spheroidizing,Stress Relieving.StandardISO,GB ...