Measurement: 17.32" x 7.87" x 7.87"Kayak car top carrier is a simple low-cost solution to carrying your kayak. This kayak carrier designed mounts to virtually all crossbars and load bars on the market. The carrier secures the kayak on its side consuming minimal space on the load bar. As shown in the pictures we put the kayak rack on the ladder rack bar. J-bar style easily supports different cargo such as skis canoes paddleboards and other outdoor gear. In addition a maximum of 4 sets of kayak racks can be mounted on a full size truck. Don't hesitate to buy it! --Brand new in box 2 pair (4 racks) for 2 kayak --Made of 1.5mm thick steel tube can hold 36" wide and up to 150 lbs kayak --Professional made out-door glossy black paint rust-free --Indented tubing design strong and stable pre-punched holes for perfect alignment --Rubber pedal foam protector all weather resistant --Space saving and easy to use