Fits on wire shelf with 1 inch shelf collar Commercial grade steel Include 4 top poles and 4 bottom poles The top pole has pole cap and pole connector pre-installed The bottom pole has feet leveler pre-installed Home Storage Space 82" Wire Shelving Poles will allow you to utilize your extra shelves for more efficient storage. This item comes with 4 top poles and 4 bottom poles. The top pole has pole cap and pole connector pre-installed. The bottom pole has feet leveler pre-installed. Using pole connector to screw top pole and bottom pole together to form 4 full length of 82" poles.