★[Carbon Steel Material] Our petal nut expansion screw is made of positive carbon metallic material, which adopts galvanized know-how to augment rust resistance. It has long servicing life, can withstand rust in the marine environment.★[Good Load-Bearing Capacity] The jack nuts set is sturdy and durable, which can stand up to widespread use. The bigger growth head can smooth and firmly fix on the board and has good load-bearing capacity.★[Easy and Safe to Install] The jack nut is straightforward and secure to put in with threaded insertion design. It can set up on the thin or delicate walls with out really expert tools or equipment. It can make sure securely fixing in place.★[Widely Uses] Our multifunctional petal nut growth screw can be used with different materials, like plastic, iron sheet, hollow space wall and more.Product Name: Petal Nut Expansion ScrewMaterial: Carbon SteelColor: Silver