This Accossato radial brake master cylinder is an Evolution in todays braking systems. It guarantees prompt and controllable braking in all circumstances. The passive stroke of the braking process is massively reduced, in all distances without any adjustments, making this master cylinder the most "Ready to Brake" handlebar master cylinder ever. The reduced weight but offers excellent rigidity, strength and brake control. Made of CNC aluminum for precision with an aesthetic and durable black anodized finish, sure to enhance the bike's overall appearance. - Piston diameter 16mm - For single disc systems - Adjustable 17, 18, 19mm - M10x1 threaded for brake hose - Zinc plated steel bleed valve - Stainless steel hardware - Integrated micro switch - Formula 1 compound rubber seals - OEM replacement reference 41700602. Note: Fluid reservoir must be purchased separately. See Accossato's billet aluminum 717630 (horizontal fluid outlet) or 717679 (vertical fluid outlet) 25cc fluid reservoirs.