How can I sharpen the concave edge?

Our high quality carbon steel blades are hardened to be tough while retaining a high degree of sharpenability. Tools that are round, oval, or narrow should be used so as to retain the width of the all important hooking effect. We offer some hand tools that work very well in addition to our Steel Master (tm) angle holding device that will do major edge beveling when required in addition to final finishing. It's very fast and easy to use and is also used on bleeder blades and knives.