Casters add 11.0" (28 cm) to overall depth. Telescoping Base Stands with Casters may be adjusted to eight height positions prior to installation. Telelescoping legs are adjustable in 1" increments from 27.5" to 34.5". Casters provide mobility for short distances, such as to gain access to the area behind the stand for service or maintenance. Toe-locking, non-marking polyurethane casters, 5" diameter, have bearings for quiet operation. Durable 1.75" tubular, epoxy-coated steel frame. Rear cross bar supports on all stands except 2' width.