Rotary FJ2439 Flat Polymer Pad Adapters add 1-1/2" height with a rubber pad surface that measures 4-3/4" x 6-5/16”. This pad protects vehicles with factory-applied undercoating, for use with pad lifts and some rolling jacks. Each adapter has a 3500 lbs. capacity. Kit includes Four 1 1/2" pad adapters.