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 5835-01-631-3940
NSN 5855-00-869-3635
NSN 5998-01-057-7985
NSN 5925-01-631-9182
NSN 5915-01-394-1105
NSN 6145-00-617-0495
NSN 5975-00-687-2196
NSN 6320-01-250-0290
NSN 5985-01-205-1234
NSN 6130-01-159-9929
NSN 7035-01-606-5440
NSN 5998-01-359-9315