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  2. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    Robertson screw. A Robertson screw, also known as a square screw[1] or Scrulox, [2] is a type of screw with a square -shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper. The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly ...

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    Drill bit. From top: Spade, brad point, masonry, and twist drills bits. Drill bit (upper left), mounted on a pistol-grip electric drill. A set of masonry drills. A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create ...

  4. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    List of screw drives. At a minimum, a screw drive is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. [1][2] Usually, it also involves a mating tool, such as a screwdriver, that is used to turn it. Some of the less-common drives are classified as being "tamper-resistant".

  5. 10 Best Drill Bits to Get Through the Toughest Metals ... - AOL

    www.aol.com/news/10-best-drill-bits-toughest...

    Measure twice, cut once, and use the correct drill bits for metal. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...

  6. Drill bit shank - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_shank

    Drill bit shank. The shank is the end of a drill bit grasped by the chuck of a drill. The cutting edges of the drill bit contact the workpiece, and are connected via the shaft with the shank, which fits into the chuck. In many cases a general-purpose arrangement is used, such as a bit with cylindrical shaft and shank in a three-jaw chuck which ...

  7. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Fractional drill bit set by Craftsman. Fractional-inch drill bit sizes are still in common use in the United States and in any factory (around the globe) that makes inch-sized products for the U.S. market. ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments.

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