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 5998-00-715-1293
NSN 5985-01-066-9012
NSN 5915-00-255-3674
NSN 6135-01-132-6310
NSN 6135-01-549-5587
NSN 5930-01-160-5623
NSN 5965-01-625-4776
NSN 6610-01-072-3447
NSN 6150-00-045-7158
NSN 4140-01-658-6870
NSN 5985-00-529-0093
NSN 6135-01-597-7685