Photo 1 of Saelno #40 Roller Chain Sprocket Type B 3/4 inch Bore 21 Tooth, Hardened Antirust 1045 Steel Drive Sprockets 40B21-3/4

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Photo 1 of Saelno #40 Roller Chain Sprocket Type B 3/4 inch Bore 21 Tooth, Hardened Antirust 1045 Steel Drive Sprockets 40B21-3/4Photo 2 of Saelno #40 Roller Chain Sprocket Type B 3/4 inch Bore 21 Tooth, Hardened Antirust 1045 Steel Drive Sprockets 40B21-3/4