The NE506B-B is a Neutral Density Filter from Thorlabs, designed with a circular base shape and a diameter of 12.7 mm. This filter is part of the UVFS MAL-1965 material ID category and has a thickness of 1.1 mm. It is designed to work with a wavelength of 633 nm and features AR coating on both the front and back, specifically THo NE06B-B. The filter's shape is thin lens, and it is currently in stock, as indicated by its weblink status. For more detailed information, users can refer to the catalog number or visit the vendor's website through the provided weblink.