Click to expand Tap to zoom 50A21H-SB Type A Plate Sprocket 21 Teeth for #50 Roller Chain Sale $14.50 SKU 50A21H-SB Quantity One - $14.50 Price Each for 2 to 4 - $13.20 Price Each on 5 or more - $12.30 title Quantity One Price Each for 2 to 4 Price Each on 5 or more 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 50A21H - SB (3/4") Bore Heat Treated Type A PLATE Sprocket for #50 Roller Chain 21 Tooth Outside Diameter = 4.520" Pitch Diameter = 4.194 Free shipping in the USA!