This knife is a practical sheath knife. The shape of the blade is dual convex. The technologically advanced process and materials used in the production of this blade, prohibits othes from creating anything similar and we have confidence in our blades surface. When pushed with force, this knife will cut through a phone book as if it were butter. Pease confirm the imploved sharpness of our evolved dual convex blade. For video of this knife in action, please view the video on the top page of this web site. It is type of blade with which we are cutting the bamboo in the bamboo grove. This blade functions best if the blade is wiped after each use without fail. The only draw back to this steel is that it has a lower tolerace to rust. Fastening bolts can be installed at your request, but are not installed unless requested.