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 5835-00-761-5615
NSN 6150-01-634-0575
NSN 6145-01-429-8529
NSN 6685-00-082-3153
NSN 5930-00-734-0258
NSN 6240-00-195-6308
NSN 6610-01-466-6338
NSN 7035-00-215-3272
NSN 6130-01-165-2130
NSN 5915-00-269-4463
NSN 5855-00-256-5562
NSN 6620-01-116-3983