Conveying Chain Sprocket; 1-1/4" Bore; 3/4" Pitch; 2190 Modular - Flat Top Size; 21 Teeth; A-No Hub Type; Finished Bore; Round; 5.067" Outside Diameter; 4.96" Pitch Diameter; Straight Running Modular - Flat Top Type; Polyamide Material; Grooved; Split; Keyway