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2. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   The French scale measures and is proportional to the outer diameter of a catheter, with 1 French (Fr) defined as 1 ⁄ 3 millimeter, making the relationship: 1 mm = 3 Fr. Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [ 2 ]

3. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm). The increments between gauge sizes are not linear and vary. [2]

4. Crochet hook - Wikipedia

   en.wikipedia.org/wiki/Crochet_hook

   A hook gauge is used for measuring both knitting needles and crochet hooks. The size of a crochet hook is determined by the diameter of its shaft. ... 9 mm 13: M/N-13 ...

5. 13 mm caliber - Wikipedia

   en.wikipedia.org/wiki/13_mm_caliber

   This is a list of firearm cartridges which have bullets that are 13 millimetres (0.51 in) caliber or larger. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge.

6. Knitting needle - Wikipedia

   en.wikipedia.org/wiki/Knitting_needle

   Double-pointed needles are somewhat shorter than single-pointed or circular needles, and are usually used in the 13–20 cm length range, although they are also made longer. Double-pointed needles are depicted in a number of 14th-century oil paintings, typically called Knitting Madonnas , depicting Mary knitting with double-pointed needles ...

7. Hypodermic needle - Wikipedia

   en.wikipedia.org/wiki/Hypodermic_needle

   Needles in common medical use range from 7 gauge (the largest) to 34 (the smallest). 21-gauge needles are most commonly used for drawing blood for testing purposes, and 16- or 17-gauge needles are most commonly used for blood donation, as the larger luminal cross-sectional area results in lower fluid shear, reducing harm to red blood cells ...