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 6685-01-219-6189
NSN 6320-01-643-0850
NSN 5910-00-982-0171
NSN 6645-01-533-3786
NSN 6220-01-439-7474
NSN 6130-00-129-6658
NSN 6145-00-974-6343
NSN 5999-01-127-2465
NSN 5945-00-171-0408
NSN 6610-00-317-5860
NSN 5960-01-122-9373
NSN 2925-01-416-6927