The 9401-M Metric Rotary Mount is perfect for mounting 1.0 inch diameter wave plates or polarizers. This affordable patented rotary stage gives you 360° rotation and 0.1° resolution with a built-in vernier scale. A removable lever lets you easily make both coarse and fine adjustments. To prevent accidental misalignment, simply remove the lever from the stage. The mount can be installed on an optical post or pedestal with its M4 thread and includes one retaining ring with 1.040-32 thread.