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 5855-01-423-7473
NSN 5990-00-566-5987
NSN 5965-00-764-1841
NSN 5855-01-418-6303
NSN 5996-01-094-2739
NSN 6645-00-011-9968
NSN 5945-01-529-6201
NSN 5999-01-341-4088
NSN 5855-00-100-9003
NSN 5945-01-261-2406
NSN 5990-01-097-4721
NSN 5965-01-122-7477