The QE 5 blade fan blades can be used with well-known manufacturers including GE, Rheem-Rudd, Singer-Climate Control, Trane, and more. Blades are made of high-strength aluminum. Each blade is clearly labeled as Pitch, Diameter, Rotation, and Maximum RPM. Includes top quality, epoxy-painted spiders with high salt spray characteristics. Features steel fixed hub with 5/16″ bore.