Designed for cargo stabilization inside trailers with wood or metal rails. Feet adjust to board/rail thickness ranging from 1/3" - 1 3/4". Collapses down to 46" for easy storage, with a full adjustment range to 106". The rubber feet provide excellent grip and will not damage surfaces. Use the GrabBar™ stop collar for rigidity in stake side truck applications. The GrabBar™ can also be used in conjunction with the SmartBar™.