Plumbatube a Concrete Pier 10" Alignment Tool -Fits most 8" and 10" Diameter Tubes Simple fool proof installation of concrete forms saves labor on setup Most accurate way to install Sonotubes, no guess work Set up all your tubular forms and pour your concrete at one time Use over and over HD polyurthane construction This is also a protractor with 360 degrees markings, set up at any angle