you can even draw with these if you heat your vial first with steaming hot water. 18 or 20 guage to draw with will tear the rubber on your vial up and then you will have little rubber pieces floating in your fina.
i use 23 gauge for delts and quads but use 27 gauge insulin pins for bis and tris. i use akits and they pass through the insulin pin with no problem it just takes a while to draw up.