A set of twenty (20) spare 10mm long screws for EK-Quantum Surface S, P, and X series radiators. Recommended for mounting the Vardar X3M fans directly to the EK-Quantum Surface radiators or in case of a thick metal mounting for the radiator where the supplied 5mm screws cannot secure the radiator. Specifications: Thread: M4 Screw length: 10mm Head type: Phillips Model: 3831109898000