Specification: Loading capacity: 88 LBS Dimensions: 30.5 in x 9.44 in x 4.6 in Frame: Cast Aluminum tubes, foam rollers, injection-molded ABS Package size: 11.42 in x 4.92 in x 4.72 in Wikbok Kayak/Canoe Loader Assist One person kayak loader The Kayak/Canoe Lift Rack simply attaches to your rear windscreen, via two powerful suction cups, allowing you to load the nose of your kayak/Canoe and simply push from the rear of the kayak/Canoe, the foam rollers are designed to prevent your car from being scratche After loading or unloading your kayak, simply flip the levers to release the vacuum cups and remove the roller. Stores it in the vehicle. Easy to install Easy to carry Strong suction with no marks Step 1 - Clean the Car Glass Use a wet towel to wipe the car glass clean before use, so that the suction cups to the glass to achieve the best suction effect. Step 2 -Mounting Suction Cups Place the kayak roller in a position where it has been wiped with a wet towel. Press two suction cups in place firmly and push down the lever until it clicks into place. Step 3 - Load the Kayak Lay the bow or stern of your kayak on the ground and move the opposite side in the middle of the roller and load the kayak to the car top.