Chromium (Tin/Lead) Anodes - 7 percent tin / 93 percent lead (Sn-7/Pb-93) round stock with a nominal outside diameter of 2.00 inches, supplied in varying lengths and estimated quantities as specified ... Chromium (Tin/Lead) Anodes - 7 percent tin / 93 percent lead (Sn-7/Pb-93) round stock with a nominal outside diameter of 2.00 inches, supplied in varying lengths and estimated quantities as specified in the statement of work.