This Martin 60BS15 1 1/4 Bored to Size Sprocket is in new, unused condition and is guaranteed to be fully functional. Please feel free to contact us with any questions. Specifications Finished Bore 1.250 in - 1 1/4 in O.D. 3.978 in Set Screw Size 5/16-18 UNC Martin No. 60BS15 No. of Teeth 15 Keyway Size 1/4 X 1/8 in No. of Screws 2 Keyway w/Keyway Set Screw Inch/Metric Inch Sprocket Style B Hub O.D. 2.875 in Length Through Bore 1.25 in Chain No. 60 Set Screw Location (1) Over Keyway and (1) At 90 Hub Dia. 2 5/8 in Width Across Teeth 0.459 in Outside Dia. [Min] 3.9780 in Outside Dia. 3.9780 in Pitch Diameter 3.607 in Pitch Dia. 3.607 in Caliper Diameter 3.1185 in Hub Projection 0.8 in Hub Length Thru 0.791 in Bore Type Finished Bore Pitch Diameter [Min] 3.607 in No. of Strands Across 1 Single Strand Tooth Thickness 0.459 in Chain Pitch 0.750 in Material Steel Hardened Teeth Without Hardened Teeth Weight 1.7 LB