This Schumacher Racing Products pinion gear features a long boss design and is cut to 48 pitch with 25 teeth, making it a direct factory replacement for builds requiring that specific tooth count and pitch combination. The long boss hub includes a set screw for secure shaft mounting. It is machined from steel for durability under drivetrain loads. Features: 48 pitch, 25 tooth count Long boss hub design Set screw included for shaft retention Steel construction 7/7/26 cs