Material: Carbon Steel + Zinc Plated. The rivet nut kit is sturdy and durable. With zinc plated on surface, these nutserts can be rust-resistant,and better than aluminum rivnuts. These Rivenut thread be easily installed in many different kinds of material, such as metal plate, plastic, fiberglass and so on. Furniture Hex Socket Screw convenient for you to pick out the one you need and easy to carry around. Rivets can be applied to fix tub, mount storage containers against the tail gate and anchor on the wheel wells. Great rivet nut installation tools to make work easier and more quick. 165 Pcs Threaded Insert Nuts Wood Screws are stored in a plastic box, and different sizes are organized in separate grids. Weight: 370 grams per box Size: Length 17.4Width 9.9Height 2.2cm Products include: M3: 50pcs rivet nuts M4: 50pcs rivet nuts M5: 30pcs rivet nuts M6: 20pcs rivet nuts M8: 15pcs rivet nuts Quantity: 165PCS pieces Note: It does not include other things, the color is based on the