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.