EXTSW1/4” ID x 1 5/8” OD x 1/4” thick 304 alloy stainless washers
Actual size .257 ID x 1.615” 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.