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 6610-00-561-4730
NSN 6650-00-764-2121
NSN 2925-00-898-9135
NSN 5985-00-913-0443
NSN 2925-00-048-7172
NSN 5915-00-719-6455
NSN 6110-00-229-9079
NSN 5996-01-559-6724
NSN 6105-01-150-1462
NSN 7035-01-566-0779
NSN 5930-00-247-8609
NSN 6610-01-425-1523