All depend on how big is the letter,i like to use a 5rl on small letters or 7r for bigger letter
In the US, knitting needle sizes are in numbers; crochet hooks use both numbers and letters.
A small needle, size 60/8, is suitable for sewing silk.
For the most common size that you would be doing it in. Line it with a 3RL, and then do your edges with 5RS. Then do the middle fill with a 15RS. The bigger the letters, the bigger the shade needle size and in some instances, the liner as well.
a 7
You use size B.use a 7 to 9 mag
The size of the needle used for injections is usually determined by the type of medication being administered and the injection site, not the weight of the person. It is best to consult with a healthcare provider to determine the appropriate needle size for a specific injection.
Butterfly needles
21 gauge
the pointed side
That would all depend on the size and the intricacy of what you are doing.
The basic knitting needle size recommended for beginners is typically a size 8 (5mm) needle.
The head of a needle is typically referred to as the "needle eye." This is the small opening at the end of the needle through which the thread passes. The eye can vary in size depending on the type of needle and its intended use, such as for sewing, embroidery, or quilting.