K&F Concept Matte Box with 4 x5.65" Filter Tray, 5 Adapter Rings for 67mm 72mm
What's more, the matte box has space for side and rail plate extensions, giving you more options. 【Compatible with 4" x 5.65" square filters】The matte box with safety lock has a rail for two 4"x 5.65" (4mm thick) square filters.