Metal Saw ToothInstead of the traditional silicone anti slip design, this jar opener has a three directional sawtooth anti slip structure. When in use, the sawtooth will tightly bite into the metal jar . It is still easy to open the jar even if there is oil or water on the surface.Scientific Lever PrincipleThe multifunctional retractable bottle opener adopts a scientific lever principle, making it easy to open even the tightest lid, which is both convenient and labor saving.Retractable DesignThe retractable design allows you to open with a diameter of 1 to 3.7in (2.5 to 9.5cm), which can open 90 percent of the in daily life.Fully FunctionalThere is also a bottle opener and tab opener on the handle. The retractable bottle opener is a must have artifact for families with children or the elderly.Thickened HandleThe extended handle can increase the force bearing distance. The thickened handle provides stable grip and easier force application.