Floor jack pads are a slotted crossline on the top of the pinch weld jack adapter, which can align with the side clip weld and protect the side, so as to prevent the frame longitudinal beam from bending when lifting the vehicle with the jack.
These are very thick and very durable. They are able to hold up to sharp sub-frames and pinch weld lifting points.
This floor jack pad adapter is used to protect the car undercarriage metal jack point railing that is on most vehicles.
It will prevent your frame rails and pinch welds from bending when using a jack to lift your car, and it can also protect painted or coated suspensions components.