Cannon's downrigger gimbal mounts enable the angler to mount Cannon electric downriggers in boats rodholder. This method is preferred by some boat owners, both for security, as you can remove the riggers easily from the boat, and because it gives a mounting option that doesn't involve drilling holes in the transom of the boat.
Simply slide the mounts gimbal tube into your boats recessed holder. Once in place, you have a base ready to accept your downrigger. No holes to drill or changes to make to your boat.