EXTSW 3/4"/ .757" ID x 1 3/8” OD x 3/16" Thick 316 Stainless Washer
Actual size is .757" ID x 1.365" OD x .188" thick
(+/- .003" on all dimensions) 
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
Made in USA. 316 Stainless has the ULTIMATE corrosion resistance.