EXTSW 7/8” / .906" ID x 2” OD x 1/2” Thick 304 Stainless Washer
Actual size .906" ID x 1.990” OD x .500" 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.