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 5915-01-087-0314
NSN 6685-00-421-5420
NSN 6650-01-426-4253
NSN 5920-01-502-0874
NSN 5855-01-341-2518
NSN 6685-01-544-3736
NSN 6645-01-633-1852
NSN 6130-01-253-4050
NSN 6110-01-461-9143
NSN 6145-01-026-0030
NSN 6240-00-144-3107
NSN 6105-01-245-8204