The Wooden Camera Swing-Away Back for Zip Box Pro 4 x 5.65" Matte Box is an interchangeable back that allows you to mount the Zip Box Pro on LWS 15mm support rods. When the matte box is mounted on the swing-away, the bracket permits 8mm total vertical adjustment and allows you to tilt your matte box. The back easily swaps out with other Zip Box Pro backs by four included screws.