Cement (concrete) finishers use concrete to make floors, walls, ceilings, sidewalks, curbs, gutters, and other concrete constructions. They may use trowels, floats, and other hand tools, or use machinery such as generators, air compressors, and power vibrators. Cement finishers also sack, chip, rub, grind, and cure finished concrete work. Some restore and repair existing concrete constructions.