The Hillman Group 310303 Number-8 Countersunk Finish Washer, 100-Pack Product Description The 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. From the Manufacturer The 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. Features 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 USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.