Platform Optical Mount, 19.05 x 19.05 mm, ±7° Adjustment, M4

Both MM-HEX and P100-P series can be post mounted as a horizontal tip/tilt platform using the threaded hole in the center or a vertical mount using the threaded hole on the side.
U50-P ULTIMA platform mounts can also be mounted horizontally with adapter , which is already included in U50-P and U50-P1 models. 

Allen-key adjustments screws are used in the miniature platform mounts to save space and prevent unintended adjustment. For long-term stability, U50-PL and U50-PL1 feature a flexure lock built into the mount body, which exerts a tangential force on the screw to prevent rotation.
    

Newport's Platform Mounts are complimented by a set of mirror cup adapters. The Mirror Cup Adapters are compatible with ULTIMA series and P100-P miniature platform mounts. They attach to the face of the platform mount through the 1/4-in. hole in the center of the platform and are locked in place by a set screw from the side. The Horizontal Adaptors attach to the mounting holes on an optical mount, providing a mechanism to convert the ULTIMA Platform Mounts to a post-mounted horizontal platform for mounting prisms, cube beamsplitters, or other components.