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 5920-01-170-5997
NSN 6645-00-334-0115
NSN 5925-00-990-2739
NSN 2925-00-572-0454
NSN 6240-00-087-1731
NSN 5998-01-349-3676
NSN 5915-01-553-0053
NSN 5975-01-651-6226
NSN 5910-01-337-5807
NSN 5935-01-623-3940
NSN 7035-01-655-5081
NSN 6150-01-522-5487