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 5945-01-571-0250
NSN 5950-01-649-2980
NSN 5965-01-270-6832
NSN 5950-01-490-1609
NSN 6110-00-244-0427
NSN 6150-01-043-7509
NSN 5925-00-186-8669
NSN 5998-01-013-3858
NSN 5920-01-122-6303
NSN 5945-00-006-9270
NSN 5935-01-366-3767
NSN 6645-00-574-9712