Center style extractor for certain Stevens model 44 actions including the 414. .290" diameter hole which is consistent with the 2-part screw/trunnion lever pin of later model actions. Check the diameter of the lever pin and the location of the extractor slot in your barrel to be sure this is the correct extractor for your rifle.
These extractor are unfit - you will need a chambering reamer to get a perfect fit. We can typically fit the extractor for a modest charge but in most cases will need your barreled action here. Contact us for more information.