1)socket assembly screws 2)Material:Carbon Steel (C1088, c1022 Hardened). 3)Zinc Plated,Yellow Zinc,Nickle Plated socket assembly screwsMATERIAL: CARBON STEEL, STAINLESS STEEL SIZE: M3-M16 OR 1/4''-5/8'' LENGTH: 6-300 CLASS: 4.8-12.9 FINISH: ZINC, BLACK, CHROME, NICKEL PACKING: BOX, CARTON OR POLY BAG + PALLET assembly socket screws / wood screws