Compact, consolidate and increase the density of freshly poured concrete by removing air bubbles with a cordless concrete vibrator. With no power cords to get in the way or accidentally drag through wet concrete, the work is easier, safer and quicker. To remove air bubbles with these tools, plunge the shaft into the wet concrete quickly and pull it out slowly. Manufacturers include DeWalt and Makita. Items vary by length, voltage, battery type, inclusions and RPM, among other considerations.