Premium Material: The Brake Proportioning Valve is made from aluminum alloy, ensuring wear resistance, durability, and long term useEasy Installation: Easy to install without complicated steps; Professional installation is highly recommendedHigh Performance: Adjustable Disk Brake Proportioning Valve has high reliability and stable performanceFeatures: The Brake Proportioning Valve is good from 100-1000PSI and provides a maximum decrease of 57% in line pressure; With this adjustment, you can fine tune the front to rear braking balance by proportionately decreasing the rear brake line pressure;When upgrading to rear disc brakes or larger front brakes, a proportioning valve is usually requiredCompact Package: Package size: 15cmx7.5cmx3.5cm/5.91inchx2.95inchx1.38inch, easy to carry and store Size Chart: Package Size: 15cmx7.5cmx3.5cm/5.91inchx2.95inchx1.38inch Package Includes: 1 Brake Proportioning Valve Note: Please allow slightly errors 1-2cm differences due to manual measurement.