... steel 3.zinc plated,black,etc 4.flat,pan, etc. types of hinges 1.Surface Finish: annealing, natural anodization, heat treatment, ... , milling, drilling, grinding, broaching, welding and assembly.3.Variety of standards:ISO,GB,DIN,JIS,ANSI4.ISO9001-2008,SGS,ROHS ... commit ourself to smile to each customer1)Details: Product name types of hinges Material1.Stainless Steel: SS201, SS303, SS304, SS316, SS416, ...