Very easy to use. Manual operation. Will not back off when weld is being made. Available in sizes 3″ to 64″. All manual Line-up clamps are precision fitted to the proper specification to insure proper alignment and quick clamping with a convenient hand lever for quick Line-up of the pipe. All manual “No-Tech” Line-up clamp have an arched bar design which allows for 360° continuous welding without clamp removal.