Feature:Fan Grills for 40mmcase fans Use these outside your case, on your computer heat sink fans or on your power suppliesProvides added safety for your computer case fan.Protects fan blades and wiring from damage.Requires 4 mounting screws (not included).Ideal protection against electronic parts injuries caused by fan blades' rotating.Please check Center to Center Pore Distance of your fan before make order, Our fan grill guard Pore Distance here:4CM Fan:3.2CM5CM Fan:4 CM6CM Fan:5 CM8CM Fan:7.15 CM9CM Fan:8.25 CM12CM Fan:10.5 CM14CM Fan:12.45 CM Specification: Product Name : Case Fan Grill Guard;Fit for : 4CM Case FanMaterial : Metal;Color : Silver TonePackage Content : 1 x Fan Grill Guard