This pipe aligner has pins that are threaded for flanges to 30" - 150 lbs. Fits flanges with holes 1/2" to 1 7/16" diameter. Will two whole and vertically level the face of the flange in ONE easy step. Comes with 360 degree vials that just "snap" in and out for easy replacement. Saves valuable fit-up time & in most cases it cuts fit-up time in half and eliminates the frustration of balancing a level on the pins. Made in the USA.