The most popular door knob locks are polished brass, polished chrome, satin chrome, and satin nickel door knobs. Refined brass is just the base brass product brightened to a high sparkle and after that bright lacquered to protect the brass from corrosion. Polished chrome and also satin chrome are a strong brass base that is chrome layered. This plating is reliable and too sturdy and also calls for very little upkeep to keep its new look.