All depend on how big is the letter,i like to use a 5rl on small letters or 7r for bigger letter
A small needle, size 60/8, is suitable for sewing silk.
In the US, knitting needle sizes are in numbers; crochet hooks use both numbers and letters.
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
The basic knitting needle size recommended for beginners is typically a size 8 (5mm) needle.
That would all depend on the size and the intricacy of what you are doing.
a hollow needle. Pretty much what you see in hospitals and such. The size depends on whichever one you ask for.