Fitting has three outer thread dimensions, ¾ NPT, 13/16-16 and ¾-16UNF, which fit 95% of all standard oil filters on the market. Inner dimension:  1/2" X 36 RH.  Fits select 9 mm platforms.  Product comes with knurled thread protector.

* Check with weapon's manufacturer, re-seller or qualified firearms professional to ensure that the fitting is a proper match for your weapon's thread dimensions and bore size.