... galvanized 4.over ten years supplier Locking fasteners from hardware factory Material:stainless steel,steel,iron,copper,aluminumDia:M5-M20Surface Finish ... ,GB,DIN,JIS,ANSI,BSWManufacture ProcessHeading/washer assembly/Threading/Secondary machine/heat treatment/plating/Anti-slipping/Baking/QA/Package/ShippingSample Availablitywe ... and help solve problem after sales locking fasteners in hardware factory