The new Scotty Ball Mounting System with Gear-Head Adapter, Post and Side/ Deck Mount provides a mounting receptacle for a variety of Scotty post mount accessories The Gear-Head's effortless drop and lock system allows the user to secure and re-position post mount accessories with just a twistThe Scotty No. 152 comes with Scotty's famous No. 241 Combination Side/ Deck MountThe ball joint design of the Scotty No. 152 enables a smooth, full range of motionThe corrosion proof construction of this system provides a long service life in both fresh and salt water applicationsBase Mount Dimensions: 4" x 2" x 2"