1). Grade: 10HV 2) Size: M12--M42 3) Surface: Plain, Black, ZP, ZY, H. D. G. etc. 4) Material: Stainless steel, alloy steel, carbon steel 5)Packaging: 25kgs per box, 36 boxes per pallet Manufacturer claims: (1)Competitive price with high quality (2)Various of Design (3)Ensure delivery in time (4)Nice solid packing