They Are designed to prevent drivers and passengers from being completely ejected from a vehicle by spreading out their bodies’ energy over their shoulders, chest, and pelvis rein a collision. $25.00 Eye bolts are used for harnesses or seat belts with clip-on Gerätschaft. These eye-bolts are sold by the pair. https://www.openlearning.com/u/lamkrogh-ss5ko5/blog/SeatBeltWebbingSafetyAnOverview