EXTSW 3/8” ID x 1 3/8” OD x 1/4” thick 316 alloy stainless washers
Actual size .384" ID x 1.365” OD x .250" 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.