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Bottle openers are devices used to remove metal caps from bottles. They typically consist of a handle and a metal lip that is used to pry the cap off of the bottle. Bottle openers come in various shapes and sizes, including handheld openers, wall-mounted openers, and keychain openers. They are commonly made of stainless steel, aluminum, or plastic, and are a common tool found in kitchens, bars, and outdoor gatherings.