NEEDLE GAUGE refers to the size of the hole in the needle. The "higher" the gauge, the "thinner" the needle (the smaller the hole). A 28 gauge needle (abbreviated 28G) is "thinner" than a 25 gauge needle.
NEEDLE LENGTH. Insulin needles are typically 1/2 inch in length or 5/16 of an inch in length. As inscribed on packaging, needle length appears after the gauge number: "28G x 1/2cc 5/16" refers to a 28 gauge needle that is 1/2 ml (cc) and is 5/16" inch long.
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