★[Carbon Steel Material] Our petal nut enlargement screw is made from superb carbon metallic material, which adopts galvanized know-how to augment rust resistance. It has long servicing life, can face up to rust within the marine environment.★[Good Load-Bearing Capacity] The jack nuts set is durable and durable, which can stand up to widespread use. The greater expansion head can smooth and firmly fix on the board and has good load-bearing capacity.★[Easy and Safe to Install] The jack nut is simple and secure to put in with threaded insertion design. It can set up on the thin or mushy walls without specialized instruments or equipment. It can ensure securely fixing in place.★[Widely Uses] Our multifunctional petal nut enlargement screw can be used with various materials, like plastic, iron sheet, cavity wall and more.Product Name: Petal Nut Expansion ScrewMaterial: Carbon SteelColor: Silver