This post-style carrier lets you safely transport 2 kayaks on your roof rack. Padded upright arms support kayaks during transport, and they fold down when not in use. Space-saving carrier clamps to most crossbars without tools. Tie-downs included. carrying more than 2 kayaks Specs: Application: square, aero, elliptical, and most factory crossbars Also fits round bars with an adapter (INISF715 - sold separately) Maximum crossbar dimensions: 3-1/2"