Narrow 16 " wide 12 gauge steel deck is perfect for narrow aisles. Each corner has 5 " polyurethane swivel wheels. Two 8 " center wheels allow the unit to pivot within its own radius. All wheels are non-marking polyurethane. Two removable handles extend 48 " above the deck to contain taller loads. The shelf can be mounted in three different heights (7-1/2 ", 21-1/2 ", 35-1/2 " from the deck) on the upright cross braces. Shelf capacity 200 lbs.