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 1/4 in Number of Teeth 10 Outside Diameter 0.919 in Pitch Diameter 0.809 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 1/2 in Hub Projection 0.5 in Standards REACH Certification RoHS Compliant