RAM Mount 1.5" Plastic Track Base Ball With T-Bolt Attachment RAP-354U-TRA1

The RAP-354-TRA1 RAM Track Adapter Base with 1.5 inch RAM rubber ball has a T-Slot attachment on the bottom, allowing it to attach to track rails found on many kayaks. Simply twist the ball clockwise to tighten, and counterclockwise to loosen and adjust the positioning.