Hex socket set screws with black zinc plated 1, ... C1006,C1010,C1018,C1022,C1035K,C1045 8, Alloy steel: SCM435,10B21Specification& gaugeM0.8-M10Surface FinishingZn- Plated,Ni-plated, ... Polish,Electro Painting,Black Anodize,Plain,Chrome plated,Hot Deep Galvanize(H. D. G. ) etc.Heat TreatmentTempering ... help solve problem after sales. 2,Factory overview 3, Warehouse and Workshop show 4,Manufacture Process 5 ...