flange nut 1.Material:stainless steel,carbon steel 2.free sample 3.over ten years manufacturing 4.certification: SGS DIN 6923 serrated hex flange nut in hardware Material:stainless steel,steel,iron,copper,aluminumDia:M2-M25Surface Finish:nickel plated,white zinc,black zinc,color zinc,black oxide,chrome platedMin Order:100000 pcsStandard:JIS,BS,ISO,DINPacking:carton box,poly bag,and paper bag,or ...