5/16" USS Flat Washers, "Copper"
type: Product
description: 3/8" Inside Diameter, fits 5/16" and 3/8" Bolts. These are not actually copper. They just turned this color when we sent them for black oxide treatment. We can't return them so maybe you can use them!
brand: Blacksmith Bolt & Rivet Supply
sku: 31FWUSCU
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  price currency: USD
  offer count: 1
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    price currency: USD
    availability: https://schema.org/OutOfStock
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    sku: 31FWUSCU

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item list element: 5/16" USS Flat Washers, "Copper"
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  item: https://productregistry.org/product/qYAOKQnq