Install flatter concrete faster with the plastic chair screed support system. The plastic chairs, set on rebar, are used to vertically support a narrow 2-in.-tall steel bar instead of a pipe commonly used by contractors when screeding concrete. Unlike a pipe, the narrow steel bar leaves only a small void in the concrete when it is removed, saving the time required to fill the void and producing a flatter surface. Spin Screed Inc. www.spinscreed.com