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