Detailed Product Description StandardGB/T897-1988,DIN938, DIN939, DIN940IFI-136 2002Grade4.8,8.8, 10.9 SizeM6-M124Surface Treatment: Plain, Black, Galvanized with Zinc, HDGMaterialCarbon Steel, Stainless Steel, 40Cr, Q235, Q345Packing:In bundles, Carton, Gunny Bag, Pallet or according to customers requirements