ishing washer has an increased bearing surface and the sunken design gives a clean appearance. The washer is designed for use with flat or oval head screws. The called out size is the inner diameter of the washer.From the ManufacturerThe finishing washer has an increased bearing surface and the sunken design gives a clean appearance. The washer is designed for use with flat or oval head screws. The called out size is the inner diameter of the washer. Ideal for increasing the load bearing surface under a fastener's head | Prevents a nut, bolt or screw from pulling through the material | Used in applications where a decorative appearance is important | For use with flat or oval head screws | Brass offers a fair degree of corrosion resistance but is commonly used for indoor, decorative applications