This Large Flange Aligner fits flanges with holes 1/2" to 1 15/16" diameter. This model of the Pipe Aligner will make 2 holes of the flange horizontally level with the ground and will vertically level the face of the flange in a single easy step. All models now come with 360 degree vials that just "snap" in and out for easy replacement. The pipe flange aligner saves fit-up time and eliminates the frustration of balancing a level on the pins.