Make your Collaborative Tables mobile with the Collaborative Tables Mobility Kit. It includes four, locking dual-wheel casters that easily replace the levelers that come standard on the Collaborative Tables. This gives you three foot options4 levelers, 4 casters, or 2 casters and 2 levelers for a wheel-barrow style. The casters are colored black to seamlessly match the Collaborative Tables legs and TRUEdge.