XL Self-Centering Aluminum Safety Flange (5″ ID Wheels) - V2Larger diameter self centering safety flange eliminates the need for center reducer plates on airway buffing wheels with 5" centers. Custom CNC machined aluminum self centering safety flange for use with 5" center buffing wheels. Fit adjusted has been adjusted to match Hilzinger buffs exclusively, forgoing Osborn (note that due to an error during machining the bottom inner ring is still a touch small but will not negatively affect centering);