The 8401-M Picomotor Rotary Mount has a minimum incremental motion around 0.1 mrad and an overall thickness of just 0.63 in. (16.0 mm), our compact stainless-steel motorized rotary stages can be used for a number of applications, including positioning wave plates and polarizers. Each rotary stage includes adapters for mounting components with either 1 in. (25-mm) or 1/2 in. (12.5-mm) diameters. It can also hold 1.5 in. (38.1 mm) optic using two retaining rings