Convert your Boost Centerlock hubs to fit Shimano HG, Micro Spline, or SRAM XD cassettes using our latest technology. Gen 4 conversion kits include a pre-assembled axle, driveshell, and adjusting clamp for a plug-and-play swap. Installation requires a 2.5mm hex key and a T10 Torx tool. Compatible with Boost Centerlock hubs. Serial numbers will begin with 831. Also compatible with Boost 6 Bolt rear hubs with serial numbers starting with 852. 148x12mm axle. Available with stainless steel or ceramic bearings. Available in Silver or Black. Contact info@chrisking.com with any compatibility questions.