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 5855-00-327-2112
NSN 5915-01-387-0486
NSN 6220-00-113-8617
NSN 5999-01-145-6304
NSN 5855-01-634-0259
NSN 5935-01-183-9995
NSN 5930-01-113-1985
NSN 5855-01-414-6265
NSN 6130-01-461-9748
NSN 6645-01-526-8782
NSN 5855-00-925-0114
NSN 6650-01-029-2995