The One Touch Automatic Bottle Opener is compatible with metal or plastic screw-on bottle caps with a maximum diameter of 55mm. The One-Touch bottle opener is ideal for people with weak or arthritic hands because it is simple to use, store, and clean. Rubber jaws automatically adjust to the size of the lid and break seals and remove caps with a smooth, effortless motion. Simply position the One Touch Automatic Bottle Opener over the bottle’s lid and press and hold the Start button. The jaws will automatically grab the lid and open it within seconds.