The Alumacraft Track Adapter for Plastic Rod Holders fits Scotty, Cabelas, Cannon, Attwood and other plastic rod holders. Pre-drilled and tapped for quick and easy installation of rod holder base. Mounting screws included. Tightening of the knob on the bottom of the mount locks it in place. Loosen the knob to slide the mount along the gunwale. Made of marine grade aluminum. Rod holder not included.