The Tube Jr. Rod Holder with Extension Arm and Track Base kit is compatible with the RAM Tough-Track to provide an ideal fishing rod holder mounting solution. Attach the Tube Jr. rod holder using the included track base, RAM ROD ratchet attachment and 8″ extension arm. The track base’s tether point secures your rod holder while the adjustable ratchet attachment allows for multiple angles, keeping you in control out on the water. T-Bolt Dimensions: .48″ x .95″