1. Size: 45 Degrees 21 Gauge. 2. Color: Purple. 3. Tip length: 13 mm, 1/2 inch. 4. Inner Diameter 0.51 mm; Outer Diameter 0.82 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 dispensing needles and are usually used for gluing the electronic components, jewelry or filling the ink, e-cigarette liquid /clay etc. They are non-sterile and are not for the purpose of hypodermic injection.