The very strong AnthroBench II is built like a tank to support 400lbs in stationary applications, 300lbs in mobile applications. Integrated cable management organizes and protects cords and cables all along the bench. Weave cords through openings on the support pan of each shelf, and then down channels in the legs. Make your AnthroBench mobile with optional 5"casters (sold separately). The single-wheel casters have soft rubber thread that moves smoothly over rough surfaces. Comes in set of 4 (two locking and two non-locking). The rounded Comfort Edge™ at the front of the AnthroBench worksurface is curved to be comfortable against your arms when working. AnthroBench comes with a single worksurface. Outfit your AnthroBench with additional shelves, legs extensions for added height, and storage options to hold everything. Install shelves at any height in 1" increments to put your equipment at a comfortable working position. Reposition shelves over time as equipment and needs change. AnthroBench comes with one shelf, two vertical legs with integrated cable management, two base tubes (2.5" diameter), two cross tubes (1.75" diameter), and four threaded leveling glides. Shelves are made of 1.25" thick, medium-density fiberboard with durable, seamless thermoplastic laminate. Front edges feature rounded bull-nose finish for comfort. Legs are hollow so you can route your cables inside. Tubes are 16-gauge steel. All metal surfaces receive a durable baked-on powder-coat finish.