Silencer mats under each shelf assure "library quiet" performance; choose from 4" or 5" castersRuggedly constructed from commercial grade cold rolled steel with heavy-duty 16-gauge, 1" round tube steel frames. Components are precisely made to eliminate any sharp edges. Curved handles provide comfort.Includes 2 tiers with a 12" shelf clearance. Top tier is a flat, 16-gauge steel shelf with a depth of 16"; ideal for transporting oversized books or parcels. Bottom tier consists of two 6 3/4"D sloped shelves.For quiet operation, all undersides are covered with sound-absorbing acoustic material.Includes 4 ball-bearing swivel casters for easy, quiet maneuvering.Choose from 4" or 5" casters, non-locking or locking:43: 4" non-locking casters43C: 5" non-locking casters43LC: 4" locking casters43CLC: 5" locking castersShips via Truck. FOB: ILCaster assembly required.Handle grips (keyword: handle pads), available and sold separately, are made of padded foam to provide comfortable, non-slip cushioning for your hands. Optional book truck bumpers (keyword: bumpers) slip onto the legs above casters to prevent trucks from bumping against furniture or walls.Finished with durable baked enamel paint available in 9 colors: -01 black, -02 blue, -08 desert sand, -18 red, -48 putty, -53 burgundy, -55 navy, -94 medium grey, -134 dark greenTo view finish choices, simply click on View Swatches located above.Overall dimensions:43 and 43LC: 36H x 30W x 17"D43C and 43CLC: 37H x 30W x 17"D