Spacer blocks are useful to obtain a level height between all of the crossbars on your vehicle. Installation is a breeze - simply place the spacers between the leg unit and the crossbar of your roof rack until all of the crossbars have been raised to an even level. Features Each spacer is 10mm high. This pack includes 2 spacers and 2 M6 x 45mm bolts. Features: Designed specifically to fit Rhino-Rack Vortex bars. Provides one bar with a 10mm increase in height. Specifications Property Value Warranty 5 Years Fits Bar Vortex Instructions View Adapter Instructions Warranty Information You can find a full copy of our Warranty Terms as well as register your Rhino-Rack product from our Warranty Page. Warranty Periods 5 years for the “Pioneer” branded roof platforms, other roof tray products and roof racks; 1 year for products made from textile and fabric, locks and electrical components; 3 years for steel (ferrous) products and components; and 5 years for all other products. Lifetime for the “Euro”, “Heavy Duty” and “Vortex” cross bar systems;