Brocraft Universal 12" Aluminum Downrigger Gimbal Mount aluminum top plate is pre-drilled and tapped, Fits BroCraft , Bigjon, Cannon and Scotty Downriggers Machined out of Aluminum. Removes easily by pulling it up and out of your rod holder Pre Drilled and Tapped 12 inch lengths with 1-1/2 inch O.D. tube.