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 5915-00-737-0924
NSN 5990-00-269-2226
NSN 6150-00-678-0075
NSN 5895-01-503-2304
NSN 5935-00-136-9710
NSN 5855-00-472-2055
NSN 6240-01-487-5182
NSN 5998-01-170-4352
NSN 5915-01-155-2644
NSN 4140-01-149-9936
NSN 5895-00-186-8572
NSN 6240-01-106-2447