The RAM-108-DU consists of a LONG length double socket arm, 2.5″ diameter round base that contains the universal AMPs hole pattern and single strap base. The strap will accommodate rails from 1″ to 2.1″ in diameter. The trolling motor stabilizer will take every bit of the vibration out of your trolling motor while all the time protecting the head, shaft and mount from damage. A must for any angler with a bow mount trolling motor.