1. Size: 22 Gauge. 2. Color: Blue. 3. Tip length: 13 mm, 1/2 inch. 4. Inner Diameter 0.41 mm; Outer Diameter 0.72 mm. 5. Blunt / Flat end (not sharp end), stainless steel tips. 6. High precision, burr-free polished. 7. Threaded luer lock; color-coded polypropylene hubs. They are blunt end dispensing needles (not sharp end) and are usually used for gluing the electronic components, jewelry etc. They are unsterile and are not for the purpose of hypodermic injection.