GCM-09120 series contains two accessaries that serve the same function, but different in size. As shown by the picture, the Glan-Taylor prism tube (GCL-070211/12/13/14) can be connected to a kinematic wave plate holder (GCM-0902/12M) by using a GCM-09120 adapter with 1.3# Hex key. As we can see that the combination of a wave plate holder with a GCM-09120 adapter provide not only tip and tilt adjustments to the lens tube, but also rotation as well.