Features: 1. Made of high-quality material, rust-resistant, solid and durable for use. 2. Interface outer diameter is 9.5mm, interface inner diameter is 6mm. 3. Suitable for computer CPU water cooling, industrial inverter drive, laser head cooling, and industrial control cabinet cooling. 4. Easy to install and convenient to use. 5. 100% and high quality. 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 cooling, industrial inverter drive, laser head cooling, industrial control cabinet cooling Optional Size: 1: Approx. 40 x 40 x 12mm / 1.6 x 1.6 x 0.5in 2: Approx. 40 x 80 x 12mm / 1.6 x 3.1 x 0.5in 3: Approx. 40 x 120 x 12mm / 1.6 x 4.7 x 0.5in 4: Approx. 40 x 160 x 12mm / 1.6 x 6.3 x 0.5in 5: Approx. 40 x 180 x 12mm / 1.6 x 7.1 x 0.5in 6: Approx. 40 x 200 x 12mm / 1.6 x 7.9 x 0.5in 7: Approx. 40 x 240 x 12mm / 1.6 x 9.4 x 0.5in Package List: 1 x Water Cooling Block Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated the same, item color displayed in photos may be slightly different from the real object. Please take the real one as standard.