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 5855-01-330-3669
NSN 6650-01-004-1625
NSN 6650-01-628-3745
NSN 6150-01-503-7627
NSN 6220-01-468-6885
NSN 5965-00-756-0457
NSN 5905-00-576-6775
NSN 5915-00-829-1629
NSN 5835-01-522-1023
NSN 5990-01-574-2522
NSN 5965-01-408-9551
NSN 5990-00-226-1152