EXTSW 1/2 ID x 1” OD x 2.150” long 316 alloy stainless shaft spacer
Actual size .507" ID x .988” OD x 2.150" Long
(+/- .003" on all dimensions) 
.030 inch Radius OD / slightly countersunk ID (no sharp edges)
Made in USA. 316 Stainless has the ULTIMATE corrosion resistance.