M11x1.25 (Common in Subaru and Nissan V6 engines). FITS: 2007 & UP YAMAHA 2.8L I4 F150/F175/F200 & 4.2L V6 F200/F225/F300/F350 4 STROKE OUTBOARD ENGINES. I am a Tool and Die Maker/Machinist by trade and developed the NS300L™ insert system our of necessity and frustration.
