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 4140-00-881-1052
NSN 5925-00-179-8327
NSN 6645-01-267-5505
NSN 5950-00-990-1322
NSN 5930-00-138-3747
NSN 6130-00-954-2859
NSN 2925-01-068-3844
NSN 5835-00-707-6266
NSN 5999-01-026-6033
NSN 4140-01-485-3321
NSN 6645-01-659-1583
NSN 6645-00-025-4771