Hillman Flat Washer Uss 3/16 is designed for use with nuts and bolts to provide a greater bearing surface, helping to prevent the nut or bolt head from damaging the material it is fastened to. This flat washer is commonly used in applications such as decks and fence building, ing reliable support and durability. The size indicated refers to the inner diameter of the washer, ensuring a proper fit for your fastening needs. Model Number: