Idler Roller Chain Sprocket, Bore Diameter 3/4 in, Chain Number 80, Sprocket Material Steel, Number of Teeth 12, Outside Diameter 4.33 in, Bearing Type Ball, For Chain Pitch 1 in, For Number of Strands Single, Hub Diameter Not Applicable, Hub Projection Not Applicable, Length through Bore 39/64 in, Lubrication Multi-Temperature Quality Bearing Grease, Pitch Diameter 3.864 in, Sprocket Width 0.61 in, Standards ANSI, Teeth Heat Treatment Hardened Teeth