From Manufacturer
The swing-away Wooden Camera Zip Box Pro 4 x 5.65" Matte Box mounts on 15mm LWS support rods (not included) and features a rear opening of 114mm. A lightweight yet durable matte box with interchangeable mounting systems, the Zip Box Pro accepts up to three 4 x 5.65" (Panavision-style) filters without the use of filter trays. If reflections from light sources in the frame are a concern, you can tilt up to two filters in the matte box to help move the reflections out of the picture area.
The matte box comes with a series of interchangeable reduction rings that provide a tight fit to prevent light from leaking around the back of the lens and flaring your filters. In its swing-away configuration, you can tilt the matte box itself. An included fabric lens donut is included for working with lenses with a non-standard front, lenses that change length while focusing or zooming, or when tilting the Zip Box Pro itself. An included carbon fiber top flag helps block veiling glare or bright reflections from striking your lens, and it can be folded down to cover the front of the matte box and provide protection to the front of your lens.