The STEMCO 6-bolt grease/oil hub cap is designed for dual compatibility with both grease and oil lubricants, offering versatile application. It effectively keeps contaminants out, thereby protecting the internal components of the wheel. Featuring a clear window, it allows for quick visual inspection of lubricant levels to ensure they are maintained properly. This hub cap is designed to endure extreme temperatures and road conditions, aiding in the consistent performance of the wheel by maintaining proper lubrication levels.