This is a 095-0215R+600 Protected Aluminium Spherical Plano-Convex Mirror, sourced from EKSMA Optics. The mirror has a diameter of 50.8 mm and a thickness of 10 mm at the center. It is designed for use with a wavelength of 300 nm and features a Schott N-BK7 glass substrate.
The mirror's geometry includes a spherical shape with a radius of curvature (R1) of 600 mm and an effective focal length (EFL) of 300 mm. This curvature type is a convex mirror, which means it diverges light rays. The mirror's front surface is coated with EKS 0015PROTAL 3000, a protective aluminium coating that enhances its durability and performance.
The mirror's web links are valid and indicate that it is currently in stock. This information, along with the detailed specifications, should help you in your selection process for optical components with similar properties.