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 5960-01-551-7034
NSN 5930-01-453-4828
NSN 6130-00-156-3029
NSN 6110-01-030-9457
NSN 6150-01-246-7415
NSN 5996-01-174-9166
NSN 6685-01-517-4271
NSN 5960-00-601-3118
NSN 5950-01-411-5364
NSN 5915-01-461-8673
NSN 6105-01-353-2526
NSN 5990-01-225-2283