Hillman 830510 1/2" SS Flat Washer Product Description Stainless steel. From the Manufacturer Used in applications with nuts and bolts. The flat washer provides a greater bearing surface which helps prevent a nut or bolt head from tearing through the material. Flat washers are commonly used in decks and fence building. The called out size is the inner diameter of the washer. Features Stainless Steel Country Of Origin: China From The Brand Name: Hillman Model Number: 830510 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.