This kit contains 280 PCS assorted flat . These sealing washers and gaskets are made of copper, solid and . They have excellent electrical conductivity and thermal conductivity. Great kit for sump plugs, water, fuel and hydraulic fittings. Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/ bolt-type connection. Feature - ColorPink - Material: Copper - Size (Box): Approx. 13 x 6.8 x 2.2 cm (LxWxH) - Sturdy and stable copper material, melting to 1083 degree centigrade. - Reliable and have simple mounting requirements. - Excellent electrical conductivity and thermal conductivity. - Clear plastic case for and storage as well as preventing loss and damage. - Great for sump plugs, water, fuel and hydraulic fittings. Applicable to all types of engines like car, marine, generator, machinery. - Contents: 30pcs M5 x 9 x 1mm 30pcs x 10 x 1mm 20pcs x 1mm 30pcs M8 x 1mm 20pcs M8 x 1mm 30pcs M10 x1mm 25pcs x 16 x 1mm 20pcs x 18 x 1.5mm 25pcs x 18 x 1mm 20pcs x 20 x 1mm 15pcs x 1.5mm 15pcs x 26 x 1.5mm Package list: 30pcs M5 x 9 x 1mm 30pcs x 10 x 1mm 20pcs x 1mm 30pcs M8 x 1mm 20pcs M8 x 1mm 30pcs M10 x1mm 25pcs x 16 x 1mm 20pcs x 18 x 1.5mm 25pcs x 18 x 1mm 20pcs x 20 x 1mm 15pcs x 1.5mm 15pcs x 26 x 1.5mm