Moved By Bikes Surfboard Racks are designed to be the best racks you can buy. Because they mount right to your frame, they are super stable. The Shortboard Specific Rack is recommended for boards up to about 7 feet in length. The tubes are pre-bent with clearance for boards up to about 3.5 inches in thickness, if you board is thicker than that the bars can be bent open a bit to make more room The splined bars slide into the mounted tubes and are held in place with a simple push button release. Push the button to remove them, slide them in till the button clicks to put them in, that's all there is to it. No point having to deal with the bars on your bike when you aren't actually using them. Made from high quality aluminum, these racks will resist corrosion and are built to last a lifetime.