These handy little end caps are all you need to convert your existing Stans 3.30 q/r hub to the more contemporary 10x135mm thru-axle. Installation is easy as pie. Simply unplug the existing 9mm end caps and insert these. Your hub is now ready to accept a 10mm thru-axle. Keep in mind, your frame will need its own upgrade kit and the actual thru-axle from the manufacturer.