1 Superior quality bolt nut at the reasonable price. 2 different standards of your chioce . 3 ISO9001.2000 certification Product name : nutsSize : M3-M27Material : carbon steel , stainless steel304 /316 , Alloy steel , Brass ..... As the customer requirementStandard : GB , ANSI . DIN , ISO ,BSW , JIS , special standard according to customer drawingsGrade : 4.8/8.8/10.9/12.9Finish: Zinc plating , ...