Spring Creek Manufacturing’s Do It Yourself Suction Cup Rack Kit provides all the parts you’ll need to convert a standard 2×4 into a rock-solid rack at an inexpensive price. You will get everything to make ONE rack, including two suction triangles, a strap for easy attachment, and hardware.Directions: To construct your rack, you first have to decide what length 2×4 you will need. If you are going to be hauling wider loads, we would recommend using a 78" 2×4. If you are hauling smaller loads, use a 2×4 that is slightly larger than the width of your vehicle. Bolt the suction cup frames to the 2×4’s so the cups are to the outside edges of your roof, by drilling a 3/8" hole (or a little bigger, if you want to remove it later – to allow for wood swelling.) Set the rack on the roof to see where to place the buckles and buckle holders to make sure they are pulling straight down and drill two other slightly over 3/8" holes and bolt on the buckle brackets. Then, place black eye pads on the ends of the 2×4’s where you wish, and bolt them on. Black straps must be placed through the cab of a vehicle by opening doors and then snuggling down securely. This includes hardware to make ONE rack.