1/4-28 Threads on one end with 5/16-18 threads on the other. Makes installing the air box top easier and quicker. Most Air boxes will need to have the holes enlarged for the studs from 1/4" to 5/16".
Made from high quality 6AL4V Titanium and Gold Vacuum coated.
Will fit any air box top that uses 1/4-28 threads in the posts such as our EVO airbox.