A small heavy weight with some means of attaching a line at one end. It is used for finding the vertical or perpendicular line to a horizontal plane.
NSN 5998-01-391-6787
NSN 5835-01-449-7511
NSN 5990-01-072-6074
NSN 6110-01-431-8407
NSN 6105-00-518-6809
NSN 6150-01-031-7603
NSN 6130-00-339-1069
NSN 6110-01-410-3434
NSN 6145-01-500-7935
NSN 6110-01-392-1936
NSN 5960-01-624-1170
NSN 6145-01-264-1673