Make sure there in lock position when you use one of the air jacks and the wheels blocked. I saw a guy jack up a car to change a tire and did not have the tires on the car blocked and when he was taking off the wheel lugs the car rolled forward off the jack and made a nice dent in the trunk. The boss just about had a Sh$$ fit when he saw the damage it done. They are a great tool if used right.
62Blue
Don
