CCI's Mine Duty Wing Pulleys are constructed from extremely heavy materials and are recognized in the industry as the most aggressive 'Mine Duty' stock pulley on the shelf. All CCI wing pulleys utilize the unique 'end-pipe' design, which offers ultimate protection against wing folding and hub-weld fatigue. Our minimum 5/8" thick contact bar yields additional life in abrasive applications where our competitors thinner bar does not. Additionally, our 3/8" thick wing and 1/4" gussets offer greater structural support in aggressive applications.