Martin Roller Chain Sprocket, Bored-to-Size, Type B Hub, Single Strand, 50 Chain Size, 0.625' Pitch, 13 Teeth, 0.625' Bore Dia., 2.911' OD, 1.875' Hub Dia., 0.343' Width
Martin Roller Chain Sprocket, Hardened Teeth, Bored-to-Size, Type B Hub, Single Strand, 50 Chain Size, 0.625' Pitch, 17 Teeth, 1.25' Bore Dia., 3.718' OD, 2.6875' Hub Dia., 0.343' Width
