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 6150-01-359-6044
NSN 5925-01-630-7205
NSN 6130-00-323-8300
NSN 6135-00-816-9052
NSN 6105-01-445-0560
NSN 5999-01-062-1774
NSN 5905-00-275-1124
NSN 7035-00-232-4043
NSN 6130-00-343-1660
NSN 5920-01-064-3723
NSN 6145-01-127-1622
NSN 5985-01-603-0695