What comes with a Bow Ducer

All Basic, Deluxe, Premium and 360 Bowducers  include latch clip on top of the downrod to prevent backing out of the cup, an index piece to always deploy the transducer in a specific direction, and all necessary mounting hardware (stainless and marine grade throughout).  

Nylon Thumbscrews are used to hold baseplates to their mounting systems (sub plates, pedestals, sport track brackets, alumacraft rails, etc).  These function to quickly remove Baseplates from the side of the boat as well as a strain relief (they will break away if the boat accidentally runs into something).