Use the Spin Screed to level freshly poured concrete fast and flat. It can be used on stiff concrete with a slump of only 3 in. Unlike vibrating screeds, when this screed brings concrete paste to the surface, it does not bring water with it. As a result, the water-to-cement ratio for the surface concrete is lower than with a vibrating screed. SpinScreed. www.spinscreed.com