The 9774 Top Actuated Mirror Mount holds 1.0 in. (25.4 mm) diameter optics, and is ideal for use in compact spaces. It gives you easy access to both tip and tilt adjustments from the knobs on top without worrying about blocking the beam. Top and side mounting schemes are compatible with post and pedestal mounting systems. Relieved bases and thick frames ensure stability, while standard beam heights allow for easy integration into your system. Built-in locks and stiff springs increase long-term stability.