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 5925-01-534-4866
NSN 6135-01-422-1440
NSN 6150-00-288-6245
NSN 5998-01-023-8080
NSN 5920-01-415-6546
NSN 6650-00-295-3609
NSN 5965-01-522-6890
NSN 5975-00-543-1195
NSN 5835-01-104-5707
NSN 6110-01-248-1751
NSN 5855-00-004-0904
NSN 5935-01-346-1510