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  2. Yankee screwdriver - Wikipedia

    en.wikipedia.org/wiki/Yankee_screwdriver

    Normally, 3 different slot type tips were included with each screwdriver when it was new. [3] Other tips included: Nut drivers in various sizes, both hex and square head; Drill points for the smallest 133/135 size screwdriver; adapters to adapt push drill size drill point sets to the three sizes of screwdriver chuck size; countersinks

  3. Nut driver - Wikipedia

    en.wikipedia.org/wiki/Nut_driver

    A nutdriver or nut driver is a hand tool for tightening or loosening nuts and bolts. It essentially consists of a socket attached to a shaft and cylindrical handle and is similar in appearance and use to a screwdriver. [1] They generally have a hollow shaft to accommodate a shank onto which a nut is threaded.

  4. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    M6 and M8 triple square drivers End view of M10 triple square screw. The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle. The name derives from overlaying three equal squares to form such a pattern with 12 right-angled protrusions (a 12-pointed star).

  5. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...

  6. Screwdriver - Wikipedia

    en.wikipedia.org/wiki/Screwdriver

    Special combination drill-driver bits and adapters let an operator rapidly alternate between the two. Variations include impact drivers, which provide two types of 'hammering' force for improved performance in certain situations, and "right-angle" drivers for use in tight spaces. Many options and enhancements, such as built-in bubble levels ...

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