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 6610-01-593-0135
NSN 6645-01-550-3038
NSN 5910-00-993-5912
NSN 5835-01-398-3859
NSN 4140-00-219-3146
NSN 5855-01-373-7538
NSN 5965-01-489-5508
NSN 6110-01-438-2604
NSN 5920-00-407-7652
NSN 6110-00-950-3058
NSN 5960-01-364-9795
NSN 5835-01-235-1125