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 5975-00-541-8531
NSN 5895-01-612-2435
NSN 5910-00-958-0414
NSN 5950-00-559-7938
NSN 6645-00-130-8464
NSN 5935-01-454-6020
NSN 5920-00-298-0700
NSN 5998-01-403-2586
NSN 5990-01-510-1430
NSN 5960-01-454-7064
NSN 5910-00-487-7845
NSN 6610-01-044-4740