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2. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   Such a drill bit is called a reduced-shank or blacksmith's drill. For example, this allows a 1 ⁄ 2 -inch (13 mm) bit to be used in a pistol-grip drill's 3 ⁄ 8 -inch (9.5 mm) chuck. One particular type of reduced-shank drill bits are Silver & Deming ( S&D ) bits, whose sets run from 9 ⁄ 16 -inch (14 mm) to 1 + 1 ⁄ 2 -inch (38 mm) drill ...

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   In wood, the brad point drill bit is another solution: the center of the drill bit is given not the straight chisel of the twist drill bit, but a spur with a sharp point, and four sharp corners to cut the wood. While drilling, the sharp point of the spur pushes into the soft wood to keep the drill bit in line.

4. File:Drill shank hex.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Drill_shank_hex.jpg

   The arbor has a hex shank. Drill bit made by Sandvik about 1988. Photo made UK, June 2005. The distance between the flats of the hex is about 10 mm. {{GFDL}}

5. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

6. Confirmat screw - Wikipedia

   en.wikipedia.org/wiki/Confirmat_screw

   They commonly come in lengths of 40, 50 and 70 millimetres (1.6, 2.0 and 2.8 in), and in shank sizes of 5, 6.3 and 7 millimetres (0.20, 0.25 and 0.28 in), with Phillips drive or hex heads. [4] Ordinary wood screws do not hold well in particleboard, which is much weaker than wood. They tend to tear out. [6] Confirmat screws have about twice the ...

7. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   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. For Morse taper -shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to ...