Bog Pod Adapt2 Accessory Plates for the Switcher Quick Change Head System - B-TCPAdapt2 twin pack contains two 1 5/8 x2 inch quick-release plates that each have one standard 1/4-20 camera screw and one 3/8-16 bushing. Use as additional quick-release plates for the SCA and PCA. Put one on your spotting scope, one on your camera and one on your video camera. Then switch between them easily and quickly. Please note: these accessory plates only work in BOGgear brand SCA and PCA adapters.