The Cosmetic surgeon's knot serves when you need to connect two different items of angling lines. It is best for looping two angling lines of different sizes. It is a very easy knot to master but it produces a mild angle in the angling line. This knot is normally helpful for those fishermens which often tend to store little bits and pieces of old fishing lines.
This knot enhances the angler's line by developing a double line as it attaches itself to much heavier hooks. This double line offers better safety. For circumstances, if among your hairs snaps when you are trying to capture a fish, you will certainly still have the one holding solid.