Long stem Dressel switch lantern burner.  Takes round felt "rattail" wick (not included).  Has screw on brass collar to enable insertion into non threaded opening.  It will easily screw off if you don't need it.  The burner itself is threaded for 7/8' opening.  Turns freely with light patina overall.  Ruler not included.  Please ask any questions before bidding.  Thanks for looking!!