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 6620-01-142-0084
NSN 6320-00-504-1214
NSN 6645-01-447-4461
NSN 6150-01-509-4421
NSN 6650-01-314-1789
NSN 2925-01-387-0870
NSN 6610-01-080-6922
NSN 6685-00-100-4753
NSN 5990-00-195-9460
NSN 6650-00-819-1165
NSN 6130-00-153-9468
NSN 6320-01-275-3972