The steel rivet nut can be installed on different types of materials, including steel, plastic and fiberglass. The rivet nut set can be applied to fix the bathtub, mount the storage containers against the rear door and anchor them in the wheel arches; You can also use rivet nut installation tools to make the job easier. Specifications: Riveting range: M3 for sheets 0.5-1.5 mm thick M4 for sheets 0.5-2, 5mm thick; M5 for a sheet that has a thickness of 0.5-3.0 mm; M6 for a sheet that has a thickness of 0.5-3.5 mm; M8 for a sheet that has a thickness of 0.5-3.5 mm; M10 for a sheet having a thickness of 1.0-5.0 mm; M12 for a sheet having a thickness of 1.0 to 6.0 mm; Product Name: Rivet Nut Type: Flat Material: Carbon Steel, Zinc Plated Package included: M3 . .. ………………… 55 pieces M4 …………… … 40 pieces M5 ………………………. 30 pieces M8 ………. . …….. ….. 10 pieces M10 …………………. 5 pieces M12 … …….. ……….. 5 pcs. Total: