The Thule 831 - 13 Foot LOCKING Load Straps are heavy-duty multi-purpose steel-core straps with lightweight aluminum cam buckles and locking covers which use Thule One-Key lock cylinders which are included with two keys. These Thule straps are designed for easy of use, strength and to be gentle around a vehicle.
The straps use rugged, cam-action buckles that do not require any knot tieing. Simply run the end of the strap through the buckle and pull out the slack. The cam-action will not let out slack until the release button is pressed, if the cover is locked the strap can still be tightened but not released until it is unlocked and the cam lever is pressed.
These security straps offer a strong theft deterrent using a steel-core within the woven polypropylene nylon. The strap will not stretch and will not weaken after prolonged exposure to moisture and sun light. Unlike big, complicated ratcheting type buckles that can easily swing out of control and ding or scratch a vehicle, the rubber bumpers that cover the Thule cam buckle protect the vehicle from its metal buckle.