Features: copper , melting point up to 1083 degree centigrades. Good electrical conductivity and conductivity. 280pcs solid copper sump plug washer set. All contained in see through compartmented plastic case. Great for sump plugs, water, fuels and fittings. A sump plug washer set to suit of engines be it Car, Marine, Generators, Machinery and Plant. Specifications: Materials: copper Color: as picture shows Box size: approx. 130x68x22mm Size types: 9 (5-M14) Quantity: 200pcs Size: (I/DxO/DxDepth) M5x9x1 30pcs M6x10x1 30pcs M6x12x1 20pcs M8x12x1 20pcs M8x14x1 20pcs M10x14x1 20pcs 20pcs M12x18x1.5 20pcs M14x18x1 20pcs Package Includes: 200Pcs Copper Washers note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid Due to the differences between different monitors, the picture may not reflect the actual of the item. Thank you!