PCD Diamond mirror Table for use with Collector II Drift Diffuse Reflectance accessory on THERMO Fisher Nicolet IS5 FTIR or any other FTIR using Collector II accessory. This listing is for the small disc as shown. It replaces cups in direct reflectance collector. It is made of polycrystalling diamond and will not scratch easily. This was my backup. It was never used. I just kept it as a spare. These are hard to find. Surface is polished to a mirror.