A drilled out lever blade shaves weight as well as improves grip. This is a full hydraulic disc brake system for drop bars. It sports an integrated master cylinder in the low-profile ergonomically shaped lever body. This brake is for single speed aficionados, the rider who wants simplicity without sacrificing braking performance. Using our Hylex Di2 Adapter Kit this system can be used with a Di2 drivetrain. Flat mount only.