Locking board system that locks not only your rack to the crossbar but it also locks your Stand Up Paddle Board to the rack. Holds up to 3 SUP Boards, or 3 long surf boards. Ratcheting mechanism for secure tightening. Rubber coated stainless steel cable strap and Crane system that keeps strap on the same side for easier loading. If you dont have padded crossbars the SUP BoardLocker comes with foam pads that universally fit factory or aftermarket crossbars.