Enhance your stargazing experience with this Barlow Lens, designed specifically for telescopes with a 31.7mm eyepiece. The lens features a 5X magnification factor and M42 * 0.75 thread interface, made from durable aluminum alloy material. The lens is fully multicoated, ensuring clear and crisp images every time. This bundle includes a standard .25in (3.7mm) barrel size and is manufactured in China. Compatible with telescope eyepieces and lenses, as well as binoculars and cameras. Invest in this high-quality Barlow Lens to take your astronomy hobby to the next level.