Here's a material that can generate all metal types (brass, chorme, titantium, gold, steel, copper, annodized metal, aluminum..) and is perfect for knobs and other metallic objects requiring cylinderical anistropic reflections. Remember: anisotropic only works with Cycles renderer.
Here are the files. Just drop them in a KPACK folder, or if you have EEVEE+Cycles you can add them to the cw-Metal KPACK.