These straps are what is called Manual Tensioning straps. They are the original design to secure wheelchairs in position. The cam & over-center buckle design ensures maximum passenger safety. Cam buckle straps (if included) are to be used in the front of the wheelchair and the overcenter buckle straps (the stronger of the two) are to be used in the rear of the wheelchair.
The universal design helps to accommodates virtually all wheelchair designs, including scooters. J-Hook help to reduce twisting of belts and ensure proper securement with a quarter turn.