Description This is a mini size 40x40x10mm cooling fan, which is made of PBT plastic material. It is suitable for most motherboard replacement North and South Bridge radiator or other cooling needs, bearing is high precision, long life and low noise. Containing high quality sleeve bearings, the fans can be run continuously for 35,000 hours; Ideal replacement for noisy or broken 12V 4cm fans in 3D printers, CPU coolers, graphics cards, DVRs, NAS, hard drives, switches, other network and storage devices, etc. Porduct Dimension Total Dimensions: 1.57 x 1.57 x 0.39 inches (40 x 40 x 10 mm) Hole to Hole Distance: 1.18 x 1.18 inches (30 x 30 mm) Screw Hole Size: Ø 0.126 inches (Ø 3.2 mm) Connector: 3-Pin (Test Speed) Cord Length: 9.84 inches (250 mm) Product Performance and Technical Specs Total Airflow: 4.95 CFM Total Noise: 23.9 dBA Fan Speed: 4500 RPM Operating Voltage: 7 to 13.5V DC Power: 0.5 W Current: 0.06 Amp Static Pressure: 0.075 In-H2O Operating Temperature: 14 to 167°F Fan Bearings: Sleeve Life Expectancy: 35,000 Hours Package Includes: 2pcs 40x40x10 mm 12V 3pin cooling fan 8cs Screw and Nuts Note: 1.Transition: 1cm=10mm=0.39 in. 2.Please allow 0-1cm error due to manual measurement. please make sure you do not mind before you ordering.