Spring nuts,channel nuts,strut nuts,fasteners: 1) Size: M6 to M12, 1/4 to 1/2" 2) Material: mild steel, SUS304 Feature:1) Size of spring nuts,strut nuts, channel nuts: M6 to M12, 1/4 to 1/2"2) Material: mild steel, SUS3043) Two kinds of connecting stylesOuter packing: Carton or poly bag + Pallet Spring Nuts