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      • The gauge of the needle refers to the outer diameter of the needle, not the length of the needle or its internal bore (lumen). Various needle lengths are available for any given gauge and some needles are manufactured with larger internal bores than standard to accommodate the particular needs of a specific product. Smaller gauge numbers indicate larger outer diameters. Needles in common medical use range from 7 gauge (the largest) to 33 (the smallest) on the Stubs scale. Inner diameter depends on both gauge and wall thickness. Thin-wall needles have identical outer diameters but larger inner diameters for a given gauge. 21-gauge needles (green hub) are most commonly used for intramuscular injections.

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