Check the listing for details. Seahorse Swivel Base with mounting base fits PENN Fathom Master by Troll-master. Condition: New. Listed at 160.00 USD. Seahorse adjustable swivel base with mounting base for Penn Fathom-Master downrigger Adjustable downrigger base is designed to accept Penn© or Cannon© downrigger mounting plates. The base rotates a complete 360° circle of rotation and locks in 36 different positions allowing you to pick virtually any angle for your downrigger. This feature provides effortless re-positioning of the downrigger boom inboard for rigging, docking or towing. The fact that this swivel base allows for installation of two leading downrigger manufacturers provides fisherman with ability to switch from manual to electric or from one brand to another without any additional investments or re-rigging efforts.Part number AR-1021 - swivelPart number PR-1001 Mounting plateThe base is brand new, all stainless hardware required for installation is included. Comes with 10 year warranty The Mounting hardware kits by Troll-master are available for sale: Hardware Kit for mounting of PENN Swivel-Matic© or Troll-Master SEAHORSE© Downrigger Swivel bases. Product number KN-4006 Ebay Item Number 121575740348 Hardware Kit for mounting of PENN or Troll-Master Fathom-Master© Downriggers. Product number KN-4002Ebay Item Number 111603626586 Hardware Kit for mounting of PENN or Troll-Master Fathom-Master© Downrigger standard bases. Product number KN-4005Ebay Item Number 111603639739