The 77368 Manually Operated Filter Wheel is a simple and inexpensive alternative to motorized filter wheels. It holds eight 1-inch diameter [25.4 mm] diameter filters ranging from 0.06 to 0.5 inch thick. A knurled knob at the top of the device rotates the wheel and indicates the filter in position. Each filter is positioned in the housing by a spring-loaded detent. The 1.5-Inch series Oriel male and female flanges mount to a variety of Oriel products. It is suggested to rod mount the 77368 for additional support using its #1/4-20 mounting hole.