Our 12 mm Yoke-Mount Axles provide threaded studs on both sides of the axle to adapt to your thru-axle equipped bike. Our axles are designed for maximum strength and versatility. This axle fits Focus RAT systems with Boost hub spacing. This axle includes a special nut for adaptation with Focus bikes with the RAT thru-axle system. You will need to remove the Focus RAT nut from your bike and replace it with the Focus nut that we provide.