TECHSPEC® Post Collars feature an aluminum collar and allow for basic post rotation. Once the collar is locked to the post at the top of the post holder, the post can be rotated within the post holder without re-adjusting height. Since the collar can be attached without removing the post, it is also great for quickly moving mounts in/out of the optical path at the same height position. TECHSPEC® Post Collars have a locking thumbscrew included. They are designed for use with Edmund Optics’ English and Metric Stainless Steel Mounting Posts.