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 5855-00-149-0766
NSN 6135-01-633-8502
NSN 5910-01-546-6582
NSN 5920-00-968-3238
NSN 6685-01-263-0630
NSN 5975-01-616-6744
NSN 7035-01-073-0394
NSN 5985-01-225-7866
NSN 5920-00-871-1045
NSN 6135-01-642-0733
NSN 6645-01-076-4655
NSN 4140-01-412-8049