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  2. Watts Brothers Tool Works - Wikipedia

    en.wikipedia.org/wiki/Watts_Brothers_Tool_Works

    Watts Brothers Tool Works is a tool manufacturer located in Wilmerding, Pennsylvania.They are known for manufacturing drill bits that can drill square holes, [1] [2] including blind holes, which cannot be made with other methods such as broaching.

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/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 different kinds of ...

  4. Safe-cracking - Wikipedia

    en.wikipedia.org/wiki/Safe-cracking

    These include protecting the locking mechanism, the bolts, and areas where drilling could be used to advantage. Special diamond or tungsten-carbide drill-bits can make some headway with some hardplates, but it is still a time-consuming and difficult process. Some high-security safes use a tempered glass relocker. This has wires that lead from ...

  5. 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.

  6. Hughes Tool Company - Wikipedia

    en.wikipedia.org/wiki/Hughes_Tool_Company

    The company was established in December 1908 [1] as Sharp-Hughes Tool Company when Howard R. Hughes Sr. patented a roller cutter bit that dramatically improved the rotary drilling process for oil drilling rigs. He partnered with longtime business associate Walter Benona Sharp to manufacture and market the bit.

  7. Tubular pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

    Such locks can be picked by a special tubular lock pick with a minimum of effort in very little time; it is also possible to defeat them by drilling with a hole-saw drill bit. Standard tubular-lock drill bit diameters are 0.375 in (9.5 mm) and 0.394 in (10.0 mm). [2] To prevent drilling, many tubular locks have a middle pin made from hardened ...

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