Constructed of 440A stainless steel, Kershaw's Ken Onion Leek folding knife features a three-inch blade and a stainless steel handle. Kershaw's assisted opening system, SpeedSafe, assists the user to smoothly open the knife with a manual push on the blade's thumb stud or Index-Open system. SpeedSafe's torsion bar helps keep the knife closed, preventing it from being opened by accident. In order to open the knife, the user must apply manual pressure to the thumb stud to overcome the resistance of the torsion bar. After the blade is out of the handle, the torsion bar moves along its track and takes over. The blade opens smoothly and locks into position, ready for use. Measuring four inches long when closed and weighing just 3.1 ounces, this versatile knife includes a limited lifetime warranty.