Chain Sprocket Bore Diameter 1/4 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Stainless Steel Maximum Bore Diameter 9/16 in Number of Teeth 15 Outside Diameter 1.326 in Pitch Diameter 1.203 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 7/8 in Hub Projection 0.5 in Standards REACH Certification RoHS Compliant