The 8817-6-V Vacuum-Compliant Nickel Plated Motorized Stability™ Mount is the vacuum-compatible version of the Model 8816-6. If offers ultraclean materials and components along with vacuum-compatible Picomotor™ actuators. It has been characterized using standard Gas Chromatography-Mass Spectrometry (GCMS). The 8817-6-V accepts 1.0 in. diameter optics up to 6 mm thick.