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Reference.org
List of screw drives
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<p>At a minimum, a <a href="/facts/Screw/Rr0k38TC">screw</a> drive is a set of shaped cavities and protrusions on the screw head that allows <a href="/facts/Torque/KcrcvNtV">torque</a> to be applied to it. Usually, it also involves a mating <a href="/facts/Tool/KhhEHz1I">tool</a>, such as a <a href="/facts/Screwdriver/vJrJRlPz">screwdriver</a>, that is used to turn it. Some of the less-common drives are classified as being "<a href="/facts/Tamper-resistant/CvYnqsQh">tamper-resistant</a>". </p><p>Most heads come in a range of sizes, typically distinguished by a number, such as "Phillips #00". </p>