This is a 092-3125R-600 protected silver plano-concave spherical mirror, sourced from EKSMA Optics. The mirror has a diameter of 25.4 mm and a thickness of 6 mm at the edge. It is designed for use with a wavelength of 400 nm and features a UVFS material ID of 1965.
The mirror's geometry includes an effective focal length (EFL) of -300 mm and a radius of curvature (R1) of -600 mm. The coating on the front surface is EKS 0025protsil 4000, specifically designed for this type of mirror.
This mirror is part of the metallic mirrors category, more specifically, it is a curved mirror with a concave base shape and a spherical shape. The mirror's web links are valid and it is currently in stock, making it readily available for your optical needs.