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Zinc Ore Sand Washer Price

7/16 in. Zinc Flat Washer (8-Pack) Flat washers are essential fasteners to keep Flat washers are essential fasteners to keep on hand. They are used with a bolt or screw to evenly spread the load over a wider area. Flat washers also prevent loosening due to vibration, stop the bolt or screw from pulling through, and can act as spacers.