Wilwood's 58 bore Left Hand Handlebar Master Cylinder is compact, lightweight and specifically designed for a variety of recreational, sport and outdoor equipment applications. Constructed of materials and finishes designed to resist corrosion, our master cylinder fits standard 78 diameter handlebars and is also available with matching RH units. Impact resistant lever assembly comes with a three - position hydraulic parking brake lock. The housing is designed to accept a threaded brake light switch (14 - 32). The large capacity reservoir is translucent for easy fluid level viewing. The fluid inlet accepts an M10 x 1 thread, Banjo type fitting.