The Big Jon Multi-Set Rod Holder Tree Base with Latch Assembly receives and secures Big Jon trolling rod tree tubes so that you can fish with multiple downrigger lines. Note: if you own an original model Big Jon tube and want to use it with this particular base, then your tube requires retrofitting for a secure and solid fit. Send your tube to Big Jon, and it will upgrade it for a nominal materials cost. (The customer is responsible for shipping and the parts). The precision-machined, flush mount Big Jon Multi-Set Rod Holder Tree Base with Latch Assembly features a hard coating. Durable heavy-duty cast aluminum base For use with multi-set rod holder trees Latch secures a solid fit The Big Jon Multi-Set Rod Holder Tree Base with Latch Assembly is made in the U.S.A.