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 5998-01-335-1398
NSN 5935-01-087-5888
NSN 6620-00-542-1579
NSN 5950-00-104-5908
NSN 6645-01-277-5973
NSN 5990-00-284-0537
NSN 6145-01-422-3937
NSN 5945-01-465-7165
NSN 5985-00-971-6998
NSN 6135-01-328-6583
NSN 5960-00-529-2704
NSN 5905-01-197-7352