EXTSW BEVELED 3/8" ID x 1 1/4" (1.240") OD x 3/8" Thick 316 Stainless Countersunk Washer
Actual size .383" ID x 1.240" OD x .375 thick - Countersunk
(+/- .003" on all dimensions) 
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
 Made in USA. 316 Stainless has the ULTIMATE corrosion resistance.