size: 5/16", thickness 1/32", corrosion resistant steel, black oxide finish, NAS1149 series washerNAS1149C0532B Flat WasherSKU: NAS1149C0532B$0.30PriceMaterialSteelOverall DiameterBetween 0.557 inches and 0.582 inchesHole SizeBetween 0.318 inches and 0.338 inchesQuantity*Add to CartBuy Now