Click to expand Tap to zoom 100A21-SB A-Plate Sprocket 21 Teeth for #100 Roller Chain Sale $62.00 SKU 100A21H-SB Quantity One - $62.00 title Quantity One 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 100A21H - SB (1 1/4") Bore Type A PLATE Sprocket for #100 Roller Chain 21 Tooth Outside Diameter = 9.040" Pitch Diameter = 8.387" FREE SHIPPING