APPLY TO - A rivet nut is used for metal plates or non-metallic, wood and other plates in housing construction, and can also be used in the assembly of furniture, household thin iron cabinets, equipment shells, and other machine and light industrial products.SPECIFICATION:Material: Carbon SteelColor: BlackFinish: Zinc PlatedHead Type: Flat HeadBody Design: Half HexThread Size: M4(Dia)Drill Hole Size: 6mm/0.23"(H)Length: 11mm/0.43"(L)Head Outer Diameter: 9mm/0.35"(D)QUANTITY INCLUDED - 20pcs x Rivet NutsADVANTAGE - All use carbon steel material, zinc plating finish, high hardness, no-rust, wear-resistance, and perfect corrosion resistance. Replace the traditional welding nut, make up for the problem of metal sheet, thin tube welding and fusible.