The RAM Torque rail mounting base securely attaches to bars 1.5" to 2" in diameter. The double-sided Pin-Lock rail base and ball allows for the connection of up to two devices and is ideal for securing small electronics, spotlights, cameras, or cup holders to ATVs, UTVs, off-road vehicles and heavy equipment rail bars. Sizing inserts are included to provide a snug fit and protection of the rail, and the mount utilizes nylon-insert locknuts to prevent loosening in high vibration environments. Available separately, the RAM B Size Ball Add-On allows you to attach an additional B Size Ball to the Torque Rail Base for mounting multiple devices.