What is the largest size of the injection needle?

The specifications and models of syringes and needles are as follows: 1ml for subcutaneous injection, size 4.5 to 5, 2.5ml for intramuscular injection, size 5.5 to 6, 2.5ml for intravenous injection, and venous blood collection, 2.5ml for 10ml, size 6.5 to 7. Note: The thickness of the needle is indicated by a number, generally There are No. 4.5, No. 5, No. 6, No. 7, etc. No. 7 is a needle with a diameter of 0.7 mm (may be the outer diameter). Generally, children use No. 4.5 or No. 5, and adults use No. 7. The needle is a hollow metal needle that can be freely detached from the head end of the syringe. For the sake of safety and hygiene, the disposable needle should be discarded after use and cannot be reused. Syringe barrels can be either plastic or glass, and usually have a graduated indication of the volume of liquid in the syringe. Glass syringes can be sterilized with an autoclave, but modern medical syringes are mostly made of plastic because plastic syringes are less expensive to dispose of

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