Rotary stage of Big Platform 7R170-190 is used to rotate manually large optical and other components through continuous 360° with accuracy of 1°, and finely to adjust them within 10° by a micrometer, with accuracy of 0.5arcmin. The stage has 88.9 mm clear aperture. The platform of the stage has a pattern of M6 and M4 mounting holes for components.

7R170V-190 Compatible with 10-6 Torr vacuum.