Features slotted pins with "friction fitting" knurled nuts for flanges to 30" - 150 lbs. All models of the Pipe aligner will two-hole (make 2 holes of the flange horizontally level with the ground) and vertically level the face of the flange in one step. All models come with 360° vials that just "snap" in and out for easy replacement. The aligner inserts easily into pipe, centers snugly against the inside pipe diameter and automatically aligns with the pipe axis.