Final answer:
Needle gauge numbers are inversely proportional to the size of the needle's bore. Thus, the needle with the lowest gauge number has the largest bore. Commonly, the range goes from 7G to 33G, with 7G having the largest bore.
Step-by-step explanation:
Needle gauge sizes determine the size of the bore or opening of a needle. The gauge number is inversely related to the size of the bore; the smaller the gauge number, the larger the bore. When comparing different gauge sizes, you will find that the gauge with the smallest number has the largest bore.
To answer which gauge size has the largest bore, one must look at the numerical value of the gauge size. Common needle gauges range from 7G (very large bore) to 33G (very small bore). For example, a 22G needle has a smaller bore than an 18G needle, meaning the 18G needle has the larger opening of the two. Consequently, among a set of gauge numbers, the lowest gauge number represents the needle with the largest bore.