Mine says 18G, To my understanding thats really tiny (1.2 mm). any idea what yours says? I'l try looking for size 7 (4.5 mm)
Chicken\pork injectors are not very common around here, I dont even think top chefs know this technique of brining\seasoning meat from the inside. It really helps with leaner parts of the pork light thigh which is very hard to cook moist but still tender.