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 5998-01-381-2536
NSN 5990-00-097-7642
NSN 5996-00-597-2234
NSN 5985-01-578-6862
NSN 5950-01-316-2006
NSN 5975-01-499-8117
NSN 5985-00-139-6025
NSN 5925-00-009-9818
NSN 5996-01-386-7421
NSN 6110-01-643-8208
NSN 6105-01-626-3469
NSN 7035-00-541-8516