ITEM NAME:1Pc 40 x 40 CM Aluminium Water Cooling Heatsink Block Waterblock Liquid CooSEAU Features: Brand new and high quality The external diameter of the connector is 9.5mm The inner diameter of the connector is 6-8mm Internal flow channel extrusion forming Brazing parts into a whole Leak rate of less than 5X10-6 mbar.l/s parts Internal fin thickness 0.5mm Specifications: Size: 40 x 40 x 12mm Spacing: 1mm Processing: vacuum aluminum brazing Package Includes: 1 x Water Cooling Heatsink Block Liquid Cooler.1 x Water Cooling Heatsink Block Liquid Cooler. Internal flow channel extrusion forming. Size: 40 x 40 x 12mm. Internal fin thickness 0.5mm. Processing: vacuum aluminum brazing.