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 4140-01-186-6453
NSN 5985-01-360-0949
NSN 6130-01-314-8364
NSN 5960-01-495-0859
NSN 5925-00-599-6339
NSN 7035-00-300-3208
NSN 2925-01-577-0004
NSN 5935-01-216-1077
NSN 6110-01-172-8380
NSN 5930-01-594-6106
NSN 5935-01-267-7189
NSN 5925-00-726-3258