H-Rail Gear-Head quickly slides into place and locks down your post mounted Scotty rod holders and accessories. This system allows you to quickly change rod holder positions with a simple “twist”. The Scotty Gear Head 438 on this mount allows you to attach and rotate Scotty parts by simply lifting and twisting them. No tools or hardware necessary for installation. Adjust the position of this accessory by loosening the red knob, opening the red gate and adjusting the mount’s position along the H-Rail.Compatibility: For use with Hobie’s H-Rail system. 2015+ Pro Angler 12, 14, and 17 kayaks and 2019+ Outback