K&F Concept Matte Box with Two 4 x 5.65" Filter Tray + 5 Adapter Rings
The matte box with safety lock has a rail for two 4"x 5.65" (4mm thick) square filters. This matte box is compatible with 4"x5.65" square filters from K&F Concept, Smallrig, Neewer, Nisi, Tilta, Tiffen and others.