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2. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%.

3. Makita - Wikipedia

   en.wikipedia.org/wiki/Makita

   Makita circular saw. Makita Corporation (株式会社マキタ, kabushiki gaisha Makita) (TYO: 6586) is a Japanese manufacturer of power tools.Founded on March 21, 1915, it is based in Anjō, Japan and operates factories in Brazil, China, Japan, Mexico, Romania, the United Kingdom, Germany, United Arab Emirates, Thailand, Indonesia, Malaysia, Philippines, Canada, and the United States.

4. Hammer drill - Wikipedia

   en.wikipedia.org/wiki/Hammer_drill

   In addition, the Chinese also used a cutting head secured to bamboo rods to drill to depths of 915 m (3,002 ft). [10] The raising and dropping of the bamboo drill strings allowed the drilling machine to penetrate less dense and unconsolidated rock formations. [11] In 1848 J.J. Couch invented the first pneumatic percussion drill. [12] [13] [14]

5. 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.

6. Drill - Wikipedia

   en.wikipedia.org/wiki/Drill

   As the prices of power tools and suitable electric motors have fallen such attachments have become much less common. Early cordless drills used interchangeable 7.2 V battery packs. Over the years battery voltages have increased, with 18 V drills being most common, but higher voltages are available, such as 24 V, 28 V, and 36 V.

7. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   Jobber-length drills are the most commonly found type of drill. The length of the flutes is between 9 and 14 times the diameter of the drill, depending on the drill size. So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length.