For mounting of Thermochill radiators or shroud with a 25mm fan, faceplate and gasket in a case. For each fan 4 screws are required! With pan head screws the length of the actual thread is given, with flat head screws the length of the whole screw is given. These self-tapping screws cut their own thread and can easily be removed and screwed in again after. Technical data: Material: Zinc coated steel length: 45mm Required tool: Torx screwdriver Extent of delivery: 1x Screw ISO 88091 3,5 x 40mm Torx flat head zinc coated Please note: Excessive application of torque to the screw may damage the radiator. Make sure the screw does not damage the radiator’s fins. Damages due to wrong application are not warranted!