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 5930-00-855-6763
NSN 6685-01-214-4626
NSN 5990-01-276-8122
NSN 5935-00-450-2998
NSN 6620-00-793-3808
NSN 5905-01-603-3633
NSN 6130-00-229-5530
NSN 6320-00-322-3460
NSN 5975-01-044-5269
NSN 5975-01-046-3287
NSN 5950-01-497-9464
NSN 2925-01-123-5856