FOR ULTIMATE ACCESSORY MOUNTING.Integrates with our H-Track Mounting system, RAM Tough-Track and most other gear tracks, the RAM Track Ball is a 1.5″ base for accessory mounting. Simply insert or slide the Track Ball into your track and twist the ball clockwise to tighten in place. Twist counterclockwise to loosen or adjust the ball.*Hobie requires a minimum shipping expense for all Hobie endorsed parts. Please contact us directly for volume shipping discounts.