CNC machined out of billet aluminum, our RS controls feature a very high tech racing look. The same master cylinder can be installed as a brake master cylinder or as an hydraulic clutch master cylinder, just flip the reservoir and lever. Master cylinder features a 9/16 inch bore and fit 1 inch handlebars. Superb engineering, smooth lines and compact dimensions make for a unique product, which will give your motorcycle the distinctive look it deserves! NOTE: master cylinders are sold individually, not in pairs.