Abstract: A concrete finishing attachment for final finishing or troweling of concrete using a portable hand power tool, such as an angle grinder, comprised of a central hub formed into a frustrum shape with a hole located centrally for registration with the spindle or arbor of the tool, and having a plurality of vanes, preferably four, disposed radially around the perimeter of the hub. Each vane has a leading stabilizer, followed by an inclined tab orientated obliquely downward relative to the stabilizer, followed by a finishing blade oriented obliquely upward relative to the inclined tab, but still obliquely downward at a slight angle. Each vane engages with the hub along the inner edge of the arc sector formed by the stabilizer. The concrete finishing attachment is used by registering the spindle of the power tool with the hole in the hub and securing with a nut or other means.