Description: This product defaults with a fixed screw outer diameter of M3.5. Surface treatment: anode Product Type: Water Cooler Scope of Application: 50mm diameter water tank?Computer Water Cooling System Surface anodizing process, will not fade Specification: Material: Aluminum Size: 155*85*8mm Package Includes: 1x8 double tank fastener 1x I-shaped buckle 2x silicone adhesive tape 1x L-shaped wrench 4x M3.5*12 screws 4x M3.5*32 screws