Ztf 840Pcs M2 M3 M4 M5 Socket Head Cap Screws Nuts Assortment Kit With Storage ??? ?????? ????? ???? ?????????? - Various M2 M3 M4 M5 Bolt Screws with Nuts and Flat Washers Meet All Demands, All of screws nuts washers are packed in a sturdy case for daily storage. ??????? ??.? ????? ????? ????? - M2 M3 M4 M5 Socket Head Cap Screws Nuts Assortment Kit is made of high quality 12.9 Grade Alloy Steel,With superior rust resistance and oxidation resistance ???? ????????? ?????? ????????? - DIN 912 Screws Bolt assortment Kit produced strictly Accord with Standardized Metric System, The average error less than 0.01mm, Easy to use and install ????-???? ??? ?? ?? ???? ??????? - Each Bolt, Nuts, washers are coverd with little Anti-Rust Oil, effectively prevent rust,Extend the fasteners' life, Classification and separately packing ?????????? ??? ?????? ??????????? - This Nut And Bolt kit are widely used in precision machinery,3D Printer, mechanical installation, electronic products, household appliances, communication products, 3D Printer locks, lamps, lights, toys, etc.