EXTSW 5/16” ID x 1 1/4” OD x 1/4” thick 304 alloy stainless washers
Actual size .323" ID x 1.240” OD x .250" thick
(+/- .003" on all dimensions)
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
Made in USA. 304 Stainless has the very GOOD corrosion resistance.