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 3/8 in Number of Teeth 12 Outside Diameter 1.083 in Pitch Diameter 0.966 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 5/8 in Hub Projection 0.5 in Standards REACH Certification RoHS Compliant