Specifications: Material: Carbon Steel(zinc plated) Combo: 165pcs / 210pcs / 300pcs (optional) Type: Flat Size: M-3/M-4/M-5/M-6/M-8/M-10/M-12 Package Size: 21144cm / 8.265.511.57in Package Weight: 876g / 30.89oz Packing List: 5 * M12 Rivet Nut 20 * M10 Rivet Nut 30 * M8 Rivet Nut 40 * M6 Rivet Nut 50 * M5 Rivet Nut 65 * M4 Rivet Nut 90 * M3 Rivet Nut 1 * Box