200pcs Copper Flat Washer Metric Ring Washer Assortment Set 9 Sizes M5-M14 With Oil Sump Plug Gasket Tool Accessories

Excellent Copper Material: The flat washers are made of high-quality copper, offering good electrical and thermal conductivity. Function: The flat washers can distribute load and prevent damage to the surface being fastened, and insulate steel screws from the surface. Uses: Can be used as a spacer, wear pad, preload indicator, locking device, and to reduce vibration. 200-Piece Assortment: 9 types of flat washers can meet your various needs, so you don't need to spend time going to the hardware store looking for washers. Perfect for electrical connections on household and commercial appliances, as well as automotive and marine applications where the power source has a threaded/bolted connection.