Description: Carbon steel countersunk head insert rivet nut can fit for all kinds of sheet metal, pipes, and other areas of the manufacturing industrial fastening. Specification: Brand: Suleve Model: MXRN6 Color: Gold Material: Carbon Steel Type: Flat Head, Knurled Body Size: M3/M4/M5/M6/M8/M10/12 Quantity: 190Pcs Features: 1. Made of high quality carbon steel. Flat head, knurled body. 2. Rust resistant and strong enough to apply in many kinds of heavy duty materials including sheet metal, steel, aluminum, plastic, fiberglass, etc. 3. Metric sizes assorted in of M3, M4, M5, M6, M8, M10, 12. Ideal rivet nut kit to meet your needs. 4. Come with durable PP storage case.