The Scotty brand rod holder base, No. 344 Round Flush Deck Mount, is used for watertight applications on kayak decks. Comes with a with splash cap and sealed bottom. Fits all Scotty post-mount rod holders and can be used as a mount for the Stern Light with Aluminum Mast with a custom PVC pipe adaptor. Base is 3.75 inches in diameter. KEX Mounting Hardware is not included. Base SCOTTY No.344 - Round Flush Mount Video.