The Hillman Group 270073 Flat Zinc Washer, 3/4-Inch, 20-Pack, Pack of 1, Steel, 20 Count
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.