This is the optional Wide Offset Wheel Hub 1mm for use with the Mugen MBX-6 (MUGC0059)FEATURES: Aluminum Construction Silver in Color 1mm OffsetINCLUDES: Two 19mm Wheel HubsREQUIRES: InstallationSPECS: Diameter- Threaded: 11mm (.43") Hex: 19mm (.74") Offset: 1mmMugenPart MUGE0240