Our countersunk billet stringer washers are 1/4" thick 6061-T6 billet aluminum and measure 3/8" ID X 1 1/4" OD. Washers are available in polished, powdercoated, and anodized finishesStringer Washer 3/8" CountersunkSKU: SW-0045$3.50PriceBasic colorsSelectQuantityAdd to CartBuy Now