FITMENT: Fit for 2003 2004 2005 2006 2007 Ford 6.0L Powerstroke. This adapter is compatible with the 1997 7.3L Ford fan clutch ONLY. The 6.0L powerstroke fan will bolt to the 1997 7.3L fan clutch. It is a great product for fleets, company vehicles and those that participate in heavy towing applications. MATERIAL: Constructed from strong and durable steel with blackening surface treatment ( Blackening means to produce a layer of oxide film on the metal surface to achieve the purpose of rust prevention and wear resistance ) .