These stages allow manual rotation through 360° and fine angular adjustments achieved through a precision worm gear drive or micrometer movement. The GCM-1104M and GCM-1105M models have a central hole to allow the passage of light or can be fitted with an optional adapter (GCM-110401M or GCM-110501M, respectively) for conversion to a solid rotation stage. The GCM-11 series can be mounted on the GCM-12 series Translation Stages or optical platforms.