Hillman Yellow Dichromate Steel 9/16 in. USS Flat Washer 50 pk

USS Hardened Flat Washers are great for adding resistance to your bolts and screws to prevent them from boring into the wood and weakening it. When selecting a washer, be sure to pick one that matches the fasteners you are already using. Picking a different finish may cause a chemical reaction, weakening your fasteners over time. Designed for use specifically with USS threaded bolts.