Product DescriptionOur set contains 9 sizes of 280 pieces of copper washers, and different sizes can meet your different needs. Used with nuts and bolts and provides a larger bearing surface to prevent the nuts or bolt heads from tearing the fastening material, flat washers are used to support and disperse the load on the exposed areas of the bolts and nuts to prevent pull through. Our products are all-copper flat washers with good sealing performance and higher heat resistance than steel and rubber washers. Copper washers are corrosion-resistant in humid environments, are non-magnetic and conductive. Product SpecificationsMaterial: red copper. Product Size: 17.8*10.5*2.3cm(7*4.1*0.9inch). Colour: bronze. Product Includes280*copper washers.