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Hillman 2-Count 5/16-in Standard Internal Tooth Lock Washer in the Lock Washers department at Lowes.com
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Amazon.com: Small Parts Internal Tooth Lock Washer, Steel, Zinc Finish, 3/8" Bolt Size, 0.3910" ID, 0.6810" OD, 0.0360" Thick, Pack Of 100 : Industrial & Scientific
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