Detailed Product Description StandardGB/T15389-1988,DIN975, DIN976Grade4.6, 4.8, 5.8,8.8, 10.9 SizeM6-M52Surface Treatment: Plain, Black, Galvanized with Zinc, HDGMaterialCarbon Steel, Stainless Steel, 40Cr, Q235, Q345Packing:In bundles, Pallet or according to customers requirements