Extang Replacement ClickLock Cover System is a state-of-the-art patented product with a round style, that brings design to the tonneau cover system. They have been designed for Classic Platinum and Saber Tonneau Covers. The ClickLocks have high-quality spring loaded ball bearings manufactured from stainless steel, that click into place with a satisfying feel. An easy pull disengages the tail rail for bulk hauling. For resecuring the tail rail, slide and click. This will result in the tail rail being locked in place. These are sold as a pair.