My purchase of this little fiber optic item for my purpose was a long shot. I needed a narrow focused beam of light to brighten up very small recesses in mineral specimens for the purpose of micro photography of minute crystals. Attached to a three watt LED goose neck lamp it indeed does that. Now I just have to find a small light diffuser to put on the tip of the fiber optic to prevent flaring caused by reflections. The product is simple but well made. Shipping was free and quick. Thankyou!

You can do any barrel with this ! 3in to 26in or longer!!!! Great product and well worth the money!! You will find many other uses for it also!