The Lindsey Optics Brilliant² Rota-Pol is designed to fit 6.6" x 6.6"” cine matte boxes and allow simple and effective rotation of the included 161mm Round Brilliant-Pol Circular Polarizer. A Rota-Pol polarizing filter is sometimes called Rota-Pola in the cinematography world . . . it's the same type of product. Rotation of the polarizer can be done by spinning either of the two thumb wheels by hand or with a motor mounted on one the 1/4–20 threads in the handle.