EXTSW 7/8” / .906" ID x 2” OD x 1/4” thick 304 stainless washer
Actual size .906" ID x  1.990” OD x .250" thick 
(+/- .003" on all dimensions) 
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
 Made in USA. 304 Stainless has very GOOD corrosion resistance.