Finishing washers, also called trim or cup washers, are ideal for increasing the load bearing surface under a fastener's head by distributing the load. Perfect for use with flat or oval head screws, the sunken design gives a clean and decorative appearance as well. The call- out size is the inner diameter of the washer. * Ideal for increasing the load bearing surface under a fastener's headPrevents a nut, bolt or screw from pulling through the materialPrevents a nut, bolt or screw from pulling through the material