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 5925-01-046-4918
NSN 5895-01-105-3300
NSN 5998-00-754-0663
NSN 5945-00-800-4214
NSN 6685-01-397-4138
NSN 6220-00-842-6897
NSN 5950-01-267-6949
NSN 6240-01-542-7239
NSN 6150-00-252-4886
NSN 5835-00-954-2833
NSN 5835-00-698-9824
NSN 5965-00-647-3972