The Scotty Slip Discs allow you to make micro adjustments to your Scotty rod holders or any of the Scotty rod holder height extenders. These discs when placed between the rod holder post and Scotty Rod Holder, allow you to obtain infinite adjustment angles. Now you can adjust your rod holder to that perfect fish fighting position! The Scotty Slip Discs are not compatible with the Scotty Fly Rod Holder. Doubles your rod holder positions, Two slip discs are necessary per rod holder, Not compatible with Scotty Fly Rod Holder, Rod holder sold separately, Sold as a pair, Model Year: 2019, Product ID: 430427, Model Number: 415a, GTIN: 0062017004150