Feature: 1. ASSORTMENT KIT: 9 sizes sealing washers kit includes M5 M6 M8 M10 M12 M14, to meet various needs. 2. 200PCS TOTAL: There is a total of 200 pcs flat washers for use, which are suitable for plugs for oil pan, water, fuel, and hydraulic fittings. 3. COPPER MADE: These sealing washers are made from excellent copper materials, the melting point is up to 1083℃. 4. EXCELLENT PERFORMANCE: Copper sealing rings has excellent electrical and thermal conductivity, very practical. 5. WIDE APPLICATION: Sealing gasket kit is suitable for all types of engines, whether in automobiles, ships, generators, machinery, or factories. Specification: Item Type: Flat Washers Material: Red Copper Weight: Approx. 160g/5.6oz Size: Approx. 13x7x2.3cm/5.1x2.8x0.9in Use: Suitable for all types of engines, whether in automobiles, ships, generators, machinery, or factories. Package List: 30 x M5x9x1mm Flat Washers30 x M6x10x1mm Flat Washers20 x M6x12x1mm Flat Washers20 x M8x12x1mm Flat Washers20 x M8x14x1mm Flat Washers20 x M10x14x1mm Flat Washers20 x M12x16x1mm Flat Washers20 x M12x18x1.5mm Flat Washers20 x M14x18x1mm Flat Washers