High quality 304 stainless steel, corrosion resistance, good toughness, abrasion resistance and low temperature resistance. Multiple sizes: M2 * 4/6/8/12/16/20, M3 * 4/8/12/16/20/30, M4 * 6/10/14/18/20/30, each size 20 pieces, 360 pieces in total. Including M2 / M3 / M4 nuts and washers, each size 120 pieces, a total of 720 pieces Different sizes can meet your different needs. Use nuts and washers for a more precise assembly. The enlarged contact area reduces stress and protects parts and screws. Suitable for repairing furniture, mechanical instruments, electronic products, household appliances, home improvement projects, communication devices, etc. If there is any problem, please contact us in time. 48 hour service is offered. Measurement M2 * 4 M2 * 6 M2 * 8 M2 * 12 M2 * 16 M2 * 20 M3 * 4 M3 * 8 M3 * 12 M3 * 16 M2 * 20 M3 * 30 M4 * 6 M4 * 10 M4 * 14 M4 * 18 M4 * 20 M4 * 30 20 pieces each M2 nut M2 seal M3 nut M3 seal M3 Seal Nut M4 120 pieces each M12 (12 pieces) Accessories M2