... : galvanized 4.over ten years supplier Locking fasteners from hardware factory Material:stainless steel,steel,iron,copper,aluminumDia:M5-M20Surface Finish ... zinc,black oxide,chrome platedMin Order:100,000 pcsStandard:JIS,BS,ISO,DINPacking:carton box,poly bag,and paper bag,or ... and help solve problem after sales locking fasteners in hardware factory