Cannon Downriggers Rail Mount Adapter. Specifications for Cannon Rail Mount Adapter f/ Rod Holder: Manufacturer: Cannon Size: One Size Color: Black Quantity: 1 Features of Cannon Rail Mount Adapter f/ Rod Holder Additional accessory for the Cannon Three-position Adjustable Rod Holder designed to provide the flexibility to fit any fishing scenario. Adapter for mounting three-position adjustable rod holders to boats with rails. Package Contents: Cannon Rail Mount Adapter f/ Rod Holder The Cannon Downriggers Rail Mount Adapter 1907050 is a quality addition to the Cannon lineup. For more great deals on Fishing Gear by Cannon please browse our Cannon Fishing Gear page. Cannon Downriggers Rail Mount Adapter 1907050