Chain Sprocket Bore Diameter 3/8 in For Chain Pitch 1/4 in For Number of Strands Single Hub Type One Side Material Stainless Steel Maximum Bore Diameter 1 in Number of Teeth 25 Outside Diameter 2.129 in Pitch Diameter 1.995 in Bore Type Plain Chain Number 25 Finish Plain Hub Diameter 1 1/2 in Hub Projection 0.625 in Standards REACH Certification RoHS Compliant