computer fan screw: 1.For cpu cooler,computer fan,power supply 2.Material:copper,iron,steel 3.Size:4.8x10(mm) or custom computer case screw 4.8x10(mm) 1.For cpu cooler,computer fan,power supply2.Size:2mm to 60mm3.Surface treatment:all kinds colors4.Hardness:meets international standards5.If customers need cooling fans,we will free screw,their packaging in the following manner: