Custom machined down aluminum hydra mount. Very slick clean design will completely hide all wires and can be installed without moving the tank. selling one for now but have a total of 3 if someone is really interested in them. the hydra 52 or 26 slides in the machined railing and wire tucks away in machined grove to give it a clean no wire sight sore. Drilling two holes from the inside of your cabined will allow to mount without moving the tank.