Detailed Product Description StandardJB/ZQ43211997, DIN,ANSI/ASME, BS, GB, JISGrade4.8,6.8, 8.8 SizeM6-M64Surface Treatment: Plain, Black, Galvanized with Zinc, HDGMaterialCarbon Steel,Mild Steel, Q235 Packing:Carton, Gunny Bag, Pallet or according to customers requirements