BRIGHTLINES Steel Cross Bars with Lock System for 2004-2010 BMW X3 Lockable and compatible with most Thule accessories. Heavy duty steel construction with rubber coating for protection. Dim: 47.2in.(L) x 1 1/4in.(W) x 7/8in.(H). Load capacity: 150lbs when load is evenly distributed. This is a complete kit that comes with a pair of crossbars, four mounting towers and lock system with instructions. Manufacturer one year limited warranty.