Gyokucho produces some of the best professional carpentry saws around the world. They use a method called impulse hardening to increase the durability of the tooth. The cutting edge is heated for 0.003~0.005 seconds by applying an electrical current, instantly hardening the surface of the steel while maintaining the flexibility inside. As a result, the saws wear resistance increases. The hardened saw tooth is much harder than sharpening files so the blade cannot be sharpened and needs to be replaced once it is dull.
Each blade is scanned and checked by image comparison software to ensure exceptional standards of quality control. The Fine woodworking range of saws are also individually tested before they leave the factory.