280pcs M5 M20 Copper Flat Washers 12 Sizes for Cars/Boats/Generators/Machines/Factory Engines

Primary material: This set of flat washers is made of high quality copper with good electrical conductivity and thermal conductivity, melting point up to 943°C Functions: Flat washers can spread a load and prevent damage to the to be fixed, and insulate the steel screws from the surface, with 12 different sizes of washers in this set. Can be used as a spacer, wear pad, preload indicator, locking device and to reduce vibration External use: this washing machine is suitable for different engines of cars/boats/generators/machines/factory Instructions for use: it can be quicker to separate them using the magnet Practical: This set includes many flat washers that can be used for a long time, so you don't have to run to the hardware for a while