Wilwood screw-in dust caps with the Wilwood logo fit perfectly in our forged billet aluminum hubs. Supplied with sealing / tensioning o-ring to keep them from unscrewing. Wilwood Wide 5 Dust Cap for Starlite style hubs is punched from .045IN thick steel plate for strength and durability. This cap wont distort crack or leak after repeated use and is gold cad plated for corrosion resistance.