Meet any storage requirement - and save money - with our multi-use, easy-to-configure shelving system. Posts are numbered in 1" increments to make adjusting shelves easy, and come with leveling bolts. For a mobile system, add stem casters with 5" non-marking, easy-roll, shock absorbing poly wheels. For cart applications, donut bumpers provide additional shock absorption and there is a 30" U-handle assembly for 18", 21" and 24" shelves.