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 6110-01-447-2770
NSN 6110-00-347-7290
NSN 6110-01-501-0687
NSN 5998-00-166-0758
NSN 5835-00-752-6065
NSN 5999-01-442-7643
NSN 5965-00-876-2378
NSN 5950-01-088-7477
NSN 7035-00-079-7189
NSN 5975-00-090-9061
NSN 4140-00-177-0463
NSN 5895-00-719-5983