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2. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   One aspect of this method of sizing is that the size increment between drill bits becomes larger as bit sizes get smaller: 100% for the step from 1/64 to 1/32, but a much smaller percentage between 1 47/64 and 1 3/4. Drill bit sizes are written as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch.

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   The drill sizes that are near this are 25 ⁄ 64 (0.391 in; 89.4%), 10 mm (0.393 in; 90%), and letter X (0.397 in; 90.8%); any of these will work well. Example (metric, coarse): For M7.0×1.0 (an intended screw with a diameter of 7.0 mm and a pitch of 1 mm between each thread, which is considered coarse ), 7.0 mm × 0.85 = 5.95 mm.

4. Tubular pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

   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 steel or contain a ball bearing in the middle pin. Some tubular locks, such as those used on older models of Kryptonite-brand bike locks, can be opened with the back end of a ...

5. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.

6. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   For example, master keyed pin tumbler locks often have two shear points at each pin position, one for the change key and one for the master key. A far more secure (and more expensive) system has two cylinders in each lock, one for the change key and one for the master key. Master keyed lock systems generally reduce overall security. [2]

7. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   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. The bit shown in the picture is a modern design for use in portable power tools, made in the UK in about 1995.