The Excelta 2843GF and 2843GC graduated round nose pliers are designed to give you 3 distinct size loops. By using the ridge formed by the graduations you are guaranteed the same size loop every time you use the same ridge. These pliers are designed with one graduated round blade and one flat (GF) or one concave (GC) blade. While I personally like the concave, it is a matter of personal choice. We sell an equal amount of both.