EXTSW BEVELED 1/2”(.507") ID x 1 1/4” (1.240") OD x 1/4"Thick 316 Stainless Washer
(Fits 1/2" #656 ARP bolts)
(Recessed .090 x .850) Beveled
(+/- .003" on all dimensions) 
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
Made in USA. 316 Stainless has the ULTIMATE corrosion resistance.