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 6650-01-633-9147
NSN 5998-01-227-5035
NSN 6130-01-336-3078
NSN 5910-01-056-8479
NSN 4140-00-223-7492
NSN 6240-01-064-9727
NSN 6135-01-302-8766
NSN 5855-01-360-4656
NSN 6610-00-893-5776
NSN 6130-01-476-5649
NSN 5975-01-268-1945
NSN 5935-01-272-6258