SPECS: Capacity: 1 Kayak Block dimensions: 14.75" x 4.0" x 3.75" FEATURES: Easily attaches to vehicles WITH or WITHOUT a roof rack Easily attach the carrier's straps to a vehicle's roof rack Can use the car clips to attach the carrier's straps to a vehicle's door frame weather molding Does not require straps to run through the inside of the vehicle Dual lock straps secure foam blocks to the rack or roof for ultimate security Dual lock straps also help secure the kayak to the foam blocks for stability Foam blocks feature a v-shaped top for securely cradling the kayak Foam blocks fit aero, square or round cross bars Rubber guards protect your vehicle and kayak from the metal cam buckles on the straps Includes 2 foam blocks, 2 dual lock straps, 4 car clips, 2 kayak end straps, mesh carry bag and set up guide