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 6150-01-056-4345
NSN 5996-01-594-8747
NSN 6320-01-006-6138
NSN 5996-00-991-3859
NSN 5910-01-394-1729
NSN 6150-00-166-5777
NSN 5925-01-263-9592
NSN 5835-00-987-9341
NSN 5920-00-161-0155
NSN 6150-01-063-7874
NSN 5905-01-380-2631
NSN 5950-00-840-7460