A a 21 gauge needle wide enough to draw up test oil from a vial? I'm from England , the only pins I can get from chemist over the counter are 23 gauge 1 inch needles that I can use for injecting, 5/8 inch 35 gauge needles that I can't use for anything and 21 gauge 1.5 inch, I was wondering if these are ok for drawing? I usually use 18's which I can order online but if these are sufficient it's far more convenient for me to go to my local chemist and free