Safe-T Mate Anti-Rollback DevicesPrevents a wheelchair from rolling back by grabbing the tires as the user attempts to sit or stand Seat lever is height adjustable for regular, hemi, and extra low wheelchairs, and depth adjustable for users who slouch in their chairs Articulating floating seat pad remains in proper alignment with seat bottom for greater comfort Adjustable spring tension accommodates a variety of seat cushions Center override lever for backing up an unoccupied chair 1