The Scotty no. 311 Drink Holder comes with a Bulkhead-Gunwale Mount and Rod Holder Post Mount. The cup holder works with all Scotty post mount rod holders. For cans, bottles, mugs and insulated sleeves. Has a convenient accessory rack to hang lures and tools. Easy to remove and set up. Please Note: The no. 241 Combination Side/Deck Mount, Lifesaver Whistle, or beverage container-insulator are NOT included. Two mounting options; on side and bottom. Comes with 2 self tapping screws, but rivets or well-nuts will be preferred by kayakers.