4×4 Mirror Board

Available at Lightbulb Rentals. The mirrored reflector is 42″ x 42″ (107x107cm) and the surface is an actual glass mirror mounted with special brackets for easy changing.
It is most commonly used for reflecting HMI Par or Xenon light sources.
The yoke has a brake in the pivot and is stand mounted via a 1-1/8″ pin.