Features: brand new and high quality Great seal:save you from leaks issues.The consistent threads make it bite in great to ensure there is no leaking in the tubes. Preven wearing off:High quality nickel plated brass,that is what makes it rust proof.And you don'for t have to worry there will be shiny painting flakes building up in one of your cooling tubes. Well built tube elbow thread on the swivel adapters.Threads in beautifully.The rotary action is smooth.Rotary makes them perfect for any loop build because they can spin for whatever angle you need. These can really make routing hard tubing quite a bit easier.You can use them for your custom water loop build.These fittings are great for adding versatility to your connections. They swivel easily and solid. Used in computer water cooling system. Easy to operate. Specifications: Material:Copper Model: 10MM/15MM/20MM/30MM/40MM Color:Silver Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Extender Base Fitting