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 5975-01-325-3954
NSN 5965-01-313-3845
NSN 5965-00-117-4214
NSN 4140-01-387-7800
NSN 5975-01-388-9789
NSN 5910-01-189-8044
NSN 5920-01-488-5186
NSN 5920-00-152-0267
NSN 5985-00-752-0632
NSN 6145-00-011-2390
NSN 5985-01-035-2974
NSN 6645-01-446-1994