Fan Guards: Type - Fan Finger Guard; Size - Fan - nominal - 50mm (1.96 in); Size - Mounting Hole Centers - 42mm (1.65") O.C; Size - Dimensions - 41.1mm (1.62") Dia.; Material Type - Steel Wire; Material Finish - Nickel Chrome; Guard Configuration - (3) Rings; Use With - 50 mm Dimensional AC/DC Fans