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 5895-01-172-1450
NSN 5965-00-985-4152
NSN 5920-00-823-6088
NSN 5965-01-053-7168
NSN 5965-01-089-8579
NSN 5960-01-443-3067
NSN 6620-00-006-6418
NSN 5835-01-495-5986
NSN 6650-01-130-6799
NSN 6610-01-645-7515
NSN 5965-01-286-6548
NSN 5965-01-576-9859