Subject Holder Inspection Arm, MS16J. This mount has a Spring-loaded hook collar which provides to securely hold items such as a ring for inspection under a Dino-Lite with a rotational or swinging movement. Optional Use: Double-sided tape included to secure MS16J to a desired surface/stand Additional Information: 1.5mm hex key (not included) can be used to tighten or loosen the tension on swing arm or rotation.