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 5999-00-840-6361
NSN 6320-01-476-7702
NSN 6650-01-237-3334
NSN 6620-01-106-3553
NSN 5935-01-586-9860
NSN 6135-00-276-7625
NSN 5930-00-815-7445
NSN 6240-00-299-9819
NSN 5960-00-007-8263
NSN 6135-00-477-8847
NSN 6135-01-056-4609
NSN 5855-01-308-0955