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2. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.

3. Wrench - Wikipedia

   en.wikipedia.org/wiki/Wrench

   The most common shapes are called open-ended spanner and ring spanner. The term wrench is generally used for tools that turn non-fastening devices (e.g. tap wrench and pipe wrench), or may be used for a monkey wrench—an adjustable pipe wrench. [1] In North American English, wrench is the standard term.

4. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   There are some exceptions with a few sizes being close enough to interchange. This includes 19 mm and 3 ⁄ 4 inch (19.05 mm), which are interchangeable for most purposes. Sizes that may interchange, depending on the precision needed, include 2 mm (close to 5 ⁄ 64 inch (1.98 mm)), 4 mm (close to 5 ⁄ 32 inch (3.97 mm)) and 8 mm (close to 5 ...

5. Impact wrench - Wikipedia

   en.wikipedia.org/wiki/Impact_wrench

   A variety of impact wrenches, in all common sizes from 1 ⁄ 4 to 1 in (6.4 to 25.4 mm), of different styles, including inline, butterfly, and pistol grip. This "reactionless" ratchet uses a miniature pin clutch impact mechanism instead of a gear reduction. Large 2 + 1 ⁄ 2 in (64 mm) Drive Ingersoll Rand impact vs 1 ⁄ 2 in (13 mm) impact ...

6. Ratchet (device) - Wikipedia

   en.wikipedia.org/wiki/Ratchet_(device)

   A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools.

7. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   The idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but such screws were probably not manufactured until around 1910. Rybczynski (2000) describes a flurry of patents for alternative drive types in the 1860s to the 1890s in the U.S., [2] which are confirmed to include internal-wrenching square and triangle types (that is, square and triangular sockets ...