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This tool is useful for keeping your hands away from contaminated surfaces in shops, restrooms, buses and subways. Use to open doors with round doorknobs (48-53mm diameter), doorlevers, door thumb turns, and to press buttons of elevator, turn on-off switches, and to grab hanging straps on subway, bus, train. Caution: This tool doesn't work on smartphones, tablets, switches with a capacitive method. This does not provide immunity against microbes.