The BT880-UN2 carousel projector mount is the latest innovative design. This mount was conceived to accommodate virtually all projectors with mounting holes within a diameter of 335mm. Supplied with a round Carousel disc, and eight arms (4 short and 4 long), this mount allows for the many mounting variations and is a truly universal projector mount. The UN2 comes with the necessary M4, M5 and M6 screws that may be needed to mount projector. Using the thumb-wheels on the Carousel, it is easy to loosen the arms and move the Carousel disc to replace the projector bulb without talking the projector off the mount.