Metcal precision te dispensing needles packs of 50 metcal 921050 te a 21 gauge dispensing needle tip from the metcal te series the needle tip consists of a stainless steel cannula with a double helix polypropylene hubthis premier quality dispensing needle is burr free with an electro polished cannula for unobstructed and consistent material flow metcal 921050 te precision te needle 21 gauge x 12 purple pack of 50