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 6620-00-500-0041
NSN 5835-00-393-1996
NSN 5965-00-464-6191
NSN 5975-01-110-6836
NSN 6220-01-189-7990
NSN 6135-00-164-8780
NSN 6240-00-952-1906
NSN 4140-01-443-1271
NSN 6150-00-965-6859
NSN 7035-01-390-1132
NSN 5990-00-185-9586
NSN 2925-01-325-3974