CNC machined aluminum Fit standard 12mm hex SLW hub bolt pattern Metric M2.5 thread (hardware included) Fit all SSD 2.2 and 1.9 Can be used on any SLW hub compatible wheels (VP, Axial, Proline, Locked Up etc...) Allow M5 locknut to fully engage Fit Axial Ryft axles Fit Losi Baja Rey axles Fit any axle with M5 thread Will also fit any axle with M4 thread as usual