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Size12 sizes 300 pieces copper washers assortment kit include M5 M6 M8 M10 M12 M14 M16 M20 different sizes can meet your different needs Material All flat washers are made of copper have a tighter seal and high heat resistance than steel and rubber washers Copper washers are corrosion resistant in wet environments nonmagnetic and electrically conductive FunctionsUsed with nuts and bolts and provide a greater bearing surface to prevent the nut or bolt head tearing through the fastened material flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through Wide Applications Widely used for sump plugs automotive brake lines fuel oil lines hydraulic accessories water A sump plug washer set fit all types of engines such as generators marine cars machinery and factory Package Include It contains 300 pieces12 sizes of the most commonly used copper flat washers all copper washers are packed in a sturdy convenient case which can be use for a storage box