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 6650-01-420-0233
NSN 6150-00-455-6424
NSN 6145-01-624-8227
NSN 5975-00-425-0524
NSN 2925-01-629-9416
NSN 5910-01-089-0416
NSN 5990-01-242-9653
NSN 5905-01-480-2186
NSN 6685-01-240-1437
NSN 5975-01-117-7324
NSN 4140-01-269-7104
NSN 6110-01-051-4196