This Exel International 26426 Needle is a 27G X 1 1/2" Thin Wall needle. Thin wall needles are thinner than regular wall needles. The outside diameter is the same size. However, the inside diameter is bigger than the regular wall's inside diameter. Thin wall needles provide more comfort with an increased flow rate.
This hypodermic needle is a hollow needle used for withdrawing fluid like blood samples, or injecting medications.