These large custom round spacers were manufactured domestically using 18-8 stainless steel material with plain finish - no passivation was required either for these specific parts. The outside diameter was set at 1-1/2" +/- .01" and the inside diameter at 1/2" +/- .01". Overall length measured 2" with the same tolerance as the other dimensions. Slight chamfer was added on both sides to smooth out the sharp edges.