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 5960-00-462-0729
NSN 6610-01-605-1509
NSN 6150-00-189-0292
NSN 5835-01-589-4735
NSN 4140-00-448-4306
NSN 5930-01-268-6371
NSN 5835-00-135-4566
NSN 5950-01-542-5493
NSN 6110-01-209-4709
NSN 5990-00-366-0112
NSN 5975-00-866-3698
NSN 4140-01-058-6602