The built-in knife is made of stainless steel and is not subject to corrosion. High hardness and long service life. It copes with its purpose perfectly. The multifunctional wrench can be used both as intended and as a knife (regular and serrated), a flashlight, a Phillips or flat screwdriver, a hex key, and so on. Provides versatility of use. Made of stainless steel, has a strong and durable body.