Provides fine adjustment to brake lever by knob on left-side handlebar. Works on all Zeta Flight lever assemblies, most Brembo, Galespeed, and Magura billet masters (does not work with Brembo RCS). Allows adjustment for play in lever due to pad wear without removing hand from throttle. Used in professional racing and by endurance teams around the world. Fully adjustable handlebar clamp mounts to all standard 7/8 inch diameter bars. CNC machined clamp and knob from A7009/A6061 billet aluminum. Conforms to FIM and MFJ racing regulations.