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2. Ring size - Wikipedia

   en.wikipedia.org/wiki/Ring_size

   Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

3. Body jewelry sizes - Wikipedia

   en.wikipedia.org/wiki/Body_jewelry_sizes

   For example, AWG 12g is 2.1 mm, but SWG 12g is 2.6 mm. AWG 8g happens to be the same as SWG 10g. AWG 000g is 10.4 mm, but SWG 000g is 9.4 mm. In most discussions of body jewelry, sizes are specified by giving the gauge, usually abbreviated by the suffix "g", the same symbol as used for grams : "12g".

4. Talk:Ring size - Wikipedia

   en.wikipedia.org/wiki/Talk:Ring_size

   The article currently says that the ring size forumula for US, Canada, Mexico is ring_diameter = 11.63 mm + 0.8128 mm × ring_size. However, I've seen many sites claim that a US size 0 is 11.53mm, not 11.63. I've seen other pages that list it as ring_diameter = 11.54 + 0.83 * ring size, which more

5. Mandrel - Wikipedia

   en.wikipedia.org/wiki/Mandrel

   A mandrel, mandril, or arbor is a tapered tool against which material can be forged, pressed, stretched or shaped (e.g., a ring mandrel - also called a triblet [1] - used by jewellers to increase the diameter of a wedding ring), or a flanged or tapered or threaded bar that grips a workpiece to be machined in a lathe.

6. Diameter - Wikipedia

   en.wikipedia.org/wiki/Diameter

   In this context, a diameter is any chord which passes through the conic's centre. A diameter of an ellipse is any line passing through the centre of the ellipse. [7] Half of any such diameter may be called a semidiameter, although this term is most often a synonym for the radius of a circle or sphere. [8] The longest diameter is called the ...

7. Boxing ring - Wikipedia

   en.wikipedia.org/wiki/Boxing_ring

   A standard ring is between 16 and 24 feet (4.9 and 7.3 m) to a side between the ropes with another 2 feet (0.61 m) outside. The platform of the ring is generally 3 to 4 feet (0.91 to 1.22 m) from the ground and is covered by about 1 inch (25 mm) of padding topped by stretched canvas. The ropes are approximately 1 inch (25 mm) in diameter and at ...