The Revar Cine Double Tray is designed to hold 138mm filters to fit matte boxes with a two 4x5.65 filter slots. Mount any 138mm close up diopter from +0.25 to +2 using this double tray that occupies 2 slots in your matte box. This 4x5.65 width tray fits all common industry standard matte boxes including Bright Tangerine, Arri, Chrosziel and many more.