They are Anti-Slip, water and sun resistant. > How to Use - Attach Carrier to Vault Cargo roof rack rails for an easy kayak transportation solution. > 250 Lbs Rated Lashing Straps - Maximum Lock tight on your kayak, Canoe, 8 Ft long (2 Pack), 250 Lbs Tested, easy and safe for your transport. Select the suitable length of Long Carriage Bolt (M8100 or M875) according to Car SUV Truck Crossbar (as shown in picture).Each bracket measures approximately 14-3/5 inches long and 4-7/10 inches wide and 15-1/2 inches high (measurements do not include mounting hardware). (2)PAIRS (4 racks for 2 kayaks). (2)Lashing Straps (250 Lbs Rated / 8 feet long). The item "2 Pair Folding Kayak Roof Rack Canoe Boat Top Mount Car Truck SUV Cross Bar" is in sale since Friday, August 24, 2018. This item is in the category "Sporting Goods\Water Sports\Kayaking, Canoeing & Rafting\Kayaks". The seller is "covinaaccessories" and is located in Ontario, California. This item can be shipped to United States.