Extend the life of your Delta Children or Simmons Kids crib with these Metal Bed Rails. Easily converting your child's crib into a full-size bed, the frame works with many of our 4-in-1 cribs. Converts many Delta Children and Simmons Kids 4-in-1 cribs to a full size bed (with headboard and footboard) Refer to your crib's instruction manual to ensure this frame is compatible with your crib.