For anglers needing a secure and adjustable mount for their large sonar graphs in big water, the Precision Sonar LockJaw Universal Fish Finder Mount is an excellent choice. This mount, crafted from 60/61 aircraft-grade aluminum and finished with a double-hammertone powder coat, ensures durability and longevity. The gear-like teeth on the base, arms, and mounting platform lock into place to prevent your display from shifting or toppling. Compatible with the Precision Sonar PMS Mount Sonar Bracket, anglers can stack two units for increased capacity. The mount features a 3.5' base with the same bolt spread as comparable mounts, ensuring a secure fit. Note that using Garmin factory gimbal brackets or plastic Lowrance gimbal brackets may require drilling your own mounting holes. The length of the arm determines model sizing.Constructed from 60/61 aircraft-grade aluminum for durabilityDouble-hammertone powder coat finish for weather resistanceGear-like teeth lock into place to prevent movementDesigned for large sonar graphs in big waterCompatible with Precision Sonar PMS Mount Sonar Bracket for stacking units3.5' base with same bolt spread as a Ram 'D' size base