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2. Ring size - Wikipedia

   en.wikipedia.org/wiki/Ring_size

   Ring size is a measurement used to denote the circumference ... for example diameter 16.92 mm is equal to size 17, 16.1 mm is equal to size 16. ...

3. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   [1] The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

4. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of 0.500 inches (12.7 mm), and runs to the highest gauge number of 36, corresponding to the smallest size of 0.004 inches (0.10 mm). Size steps between gauges range from 0.001 inches (0.025 mm) between high gauge numbers to 0.046 inches (1.2 mm ...

5. Needle gauge comparison chart - Wikipedia

   en.wikipedia.org/?title=Needle_gauge_comparison...

   What links here; Related changes; Upload file; Special pages; Permanent link; Page information; Cite this page; Get shortened URL; Download QR code; Wikidata item

6. Surgical suture - Wikipedia

   en.wikipedia.org/wiki/Surgical_suture

   1/4 circle; 3/8 circle; 1/2 circle. Subtypes of this needle shape include, from larger to smaller size, CT, CT-1, CT-2 and CT-3. [3] 5/8 circle; compound curve; half curved (also known as ski) half curved at both ends of a straight segment (also known as canoe)

7. Injector pen - Wikipedia

   en.wikipedia.org/wiki/Injector_pen

   [2] [7] Today, pen needles are manufactured at shorter needle lengths than required for typical vial and syringe administration, which decreases the pain associated with injection. [2] They are available in multiple lengths and gauge of needle, including 3.5mm, 4mm, 5mm, and 8mm lengths, and 31 through 34 gauge. [8]