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 7035-01-456-4490
NSN 5920-01-366-5991
NSN 5905-01-634-0595
NSN 5998-01-623-9613
NSN 6105-00-900-8304
NSN 4140-01-030-1298
NSN 6150-00-552-2073
NSN 5975-01-643-2884
NSN 5915-00-406-6460
NSN 6620-01-023-2938
NSN 5855-00-149-0766
NSN 5925-00-900-5354