The GF-31 is essentially the fully forged version of the more popular G-21 Boning knife. Both knives have long thin blades which make the knife good for getting between the skin and the meat of the fish. The main difference between the two knives is the addition of a bolster. The bolster gives a lot of extra protection by preventing hands from slipping forward onto the blade. The main drawback is the fact that this blade is not as flexible. There is a trade off between the strength of the fully forged blade and have a flexible knife. This makes the knife better for more regular use, in professional kitchen settings, where repeated use of the boning knife is needed.