The Troll-Master Seahorse Swivel Base fits all Penn and Cannon downrigger models. It rotates a complete 360 degree circle of rotation and locks in 36 different positions, allowing to pick virtually any angle for the downrigger. This feature makes it effortless for re-positioning of the downrigger boom inboard for rigging, docking, or towing. This swivel base withstands weather elements, UV and corrosion. Heavy duty designEasy on finger lock operation