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2. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   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 3¼ inches, and a single 1/4 inch increment to 3½ inches. One aspect of this method of sizing is that the size increment between drill bits ...

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).

4. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   The diameter of auger bits for hand braces is commonly expressed by a single number, indicating the size in 16ths of an inch. For example, #4 is 4/16 or 1/4 in (6 mm), #6 is 6/16 or 3/8 in (9 mm), #9 is 9/16 in (14 mm), and #16 is 16/16 or 1 in (25 mm). Sets commonly consist of #4-16 or #4-10 bits.

5. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   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 body diameter with a standard 1 ⁄ 2 -inch (13 mm) reduced shank for ...

6. Watts Brothers Tool Works - Wikipedia

   en.wikipedia.org/wiki/Watts_Brothers_Tool_Works

   The Harry Watts square drill bit is based on a Reuleaux triangle shape. It is used together with a guide and a particular chuck to make a square hole. [3] [4] Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons.

7. Drill press - Wikipedia

   en.wikipedia.org/wiki/Drill_press

   Often they have an adjustable depth stop [2] and the ability to lock the handle at a given height. Most have adjustable speeds, and different speeds should be used for different materials and drill types, for example from 100-3600 r/min. Small drill diameters require higher speeds, and soft materials require higher speeds. [3]