Features: Made of zinc plated stainless steel, strong and sturdy, ensuring long life. Optional size 7 Specifications meeting different requirements. Suitable to apply in many kinds of heavy materials, including sheet metal, steel, aluminum, plastic, fiberglass, etc. Widely used in automobile, furniture, decoration and other electrical and industrial products and so on. Features: Material: Stainless Steel (Plated zinc) Size: M3 (100pcs) / M4 (100pcs) / M5 (100pcs) / M6 (100pcs) / M8 () / M10 50pcs (10pcs) / M12 (10pcs) (optional) Type: Flat Package size: 10 * 7 * 1.7cm / 3.93 * 2.75 * 0.66in Package weight: 125g / 4.4oz Packing list : 100 * M4 Rivet Nut