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 7/16 in Number of Teeth 13 Outside Diameter 1.164 in Pitch Diameter 1.045 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 3/4 in Hub Projection 0.5 in Standards REACH Certification RoHS Compliant