BlackStar 120BS26 1 1/2 K2S - 120 Pitch Finished Bore Sprocket - 26 Tooth - 1-1/2" BoreThe BlackStar 120BS26 1 1 2 K2S is a 120 pitch Finished Bore roller chain sprocket with 26 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 120BS26 1 1 2 K2S Chain Pitch 120 Number of Teeth 26 Bore Size 1 1 2" Minimum Bore 1 1 2" Maximum Bore 4"