300 copper O-ring set 12 drain connector sizes with spring washers <ul class="a-un0rdered-list a-vertical a-spacing-mini"> <li class="a-spacing-mini"><span class="a-list-item">【High Quality】These washers are made of high-quality copper, durable and rust-resistant, with a melting point of up to 1083 degrees Celsius. They have good electrical and thermal conductivity. </span></li> <li class="a-spacing-mini"><span class="a-list-item">【12 Sizes】300 assorted copper washers, M5, M6, M8, M10, M12, M14, M16, M20. 12 most commonly used sizes of copper flat washers. </span></li> <li class="a-spacing-mini"><span class="a-list-item">【Quantity】Contains 12 most commonly used sizes of copper washers, a total of 300 pieces. Different sizes can meet different requirements, and 300 copper washers are enough for daily use. </span></li> <li class="a-spacing-mini"><span class="a-list-item">【Easy to Use】The sealing ring kit is very simple to install, and the copper flat washers have a smooth surface, which can reduce friction between fasteners, prevent leaks, insulate, and prevent loosening or pressure dispersion. </span></li> <li class="a-spacing-mini"><span class="a-list-item">【Wide Application】Copper flat washers are used for oil pan plugs, automotive brake lines, hydraulic fittings, electrical connections for household and commercial appliances, and threaded or screwed electrical supplies for automobiles and marine vessels. </span></li> </ul>