Supplying flawless friction guidance to your industrial hardware. Crafted from advanced technical polymer, this auto-adjust carriage attaches to FG115 aluminum rails, offering constant preload force that will endure these conditions (and harsh environments) throughout the lifespan of its intended application. With the use of included plastic pins, tension between the rail and carriage remains preset. Furthermore, the carriage's internal springs create constant and consistent tension between the hardware's core elements.