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triple-square screw drive

screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle

en-GB/ˈtɹɪpəl - ˈskwɛə ˈskɹuː ˈdɹaɪv/
en-US/ˈtɹɪpəl - ˈskwɛɹ ˈskɹu ˈdɹaɪv/

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clutchscrew drivetechnical standardphysical tool