Aluminum Water Cooling Block Waterblock Cooler CPU Water Cooling Head Flat Effluent (#1) Features: 1. Made of material, rust-resistant, solid and durable e. 2. The interface outer diameter is 9.5mm, the interface inner diameter is 6mm. 3. Suitable for computer CPU water, industrial frequency inverter drive, laser head cooling, industrial control cabinet cooling. 4. Easy to install and convenient e. 5. . Specification: Condition: Item Type: Water Cooling Block Material: Pure Aluminum Processing: Vacuum Aluminum Brazing Interface outer diameter: Approx. 9.5mm / 3.7in Interface inner diameter: Approx. 6mm / 2.4in Application: Suitable for computer CPU water, industrial inverter drive, laser head cooling, industrial control cabinet cooling Optional Size:  #1: Approx. 60 * 60 * 12mm / 2.4 * 2.4 * 0.5in #2: Approx. 60 * 180 * 12mm / 2.4 * 7.1 * 0.5in Package List: 1 * Water Cooling Block Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.