computer fan screw: 1.For cpu cooler,computer fan,power supply 2.Material:copper,iron,steel ... ) or specify computer case screw 4.8x10(mm)1.For cpu cooler,computer fan,power supply2.Size:2mm to 60mm3.Surface ... ,we will free screw,their packaging in the following manner: cpu fan parts---Iron screw 4.8x10(mm)