Profile's drive side hub guard, CNC machined from 7075 aluminum. Fits 9 & 10 tooth drivers, the chain will rub with an 11t driver. Guard fits over the drive side jam nut. Once wedged in between the drop out & jam nut, the guard remains stationary. Integrated aluminum 14mm step for your drop out that serves as an anti-rotational pin. For use with 14mm axles only.