$29, Scotty Rocket Launcher Rod Holder SS Jacket w/344 Mount (473)

Fully Adjustable rod holder with over 9" of stainless steel jacketed composite construction, accomodating all rods. Attaches to any Scotty Downrigger Boom.Main features:Heavy Duty Stainless SteelUnique Side or Deck Mounting Bracket with new Lock Down FeatureTilts up and down, including upright for rod storage when travellingLess missed strike opportunitiesSwivels 360 degreesLocks closed for travellingIncludes the No. 344 which has a sealed base for watertight applications(such as kayak decks) with splash cover. For all Scotty post mount rod holders.Diameter: 3 3/4"Bolting Dimensions: 2 3/16" x 2 3/16"

Source: http://www.manventureoutpost.com/products/Scotty-Rocket-Launcher-Rod-Holder-SS-Jacket-w%7B47%7D344-Mount-%28473%29.html?google=1