(1 pc) extsw 20 mm ID x 38 mm OD x 6.37 mm thick 304 / A2 Alloy Stainless Washer
0.7 mm Radius OD / Countersunk ID (no sharp edges)
21.05 mm ID x 37.84 mm OD x 6.35 mm Thick (+/- .076mm on all dimensions)
.828inch 1.490inch .250inch (+/- .003 on all dimensions)
Made in USA on a CNC lathe
It is a beautiful fit for your 20mm Stainless bolts
Just contact me if you need a custom size washer.