This washer set features thin, disk-shaped plates with a center hole, designed for load distribution of threaded fasteners like screws and nuts. They can also serve as spacers, wear pads, preload indicators, locking devices, and vibration reducers. High-quality hardened steel washers are essential for maintaining preload after torque application and preventing galvanic corrosion by insulating steel screws from aluminum surfaces. Made from high-quality copper, these flat washers ensure good electrical and thermal conductivity while protecting surfaces from damage. The set includes various sizes suitable for different applications, ensuring long-term use without the need for frequent replacements. Material: Copper Color: Copper Type: Flat Washer Sizes Included: - M5*9*1mm - 30 pcs - M6*10*1mm - 30 pcs - M6*12*1mm - 20 pcs - M8*12*1mm - 30 pcs - M10*14*1mm - 30 pcs - M8*14*1mm - 20 pcs - M12*16*1mm - 25 pcs - M14*18*1mm - 25 pcs - M12*18*1.5mm - 20 pcs - M16*20*1.5mm - 20 pcs - M16*22*1.5mm - 15 pcs - M20*26*1.5mm - 15 pcs Package Contents: 280 copper washers and 1 plastic box. Please note that only the listed items are included. Colors may vary slightly due to lighting and display differences. Measurement errors of +/- 1-3cm may occur.