FOTGA DP3000 M4 DSLR swing away Matte Box Kits with top handle for All Camera Rigs with 15mm Rod Systems French Flag/Side Flags. Flags provide extra flare reduction.They are quick removable. They can be opened to the desired length by using the small knob provided on the flags. Combined with a top handle bracket rig. handle grip can be installed both side,for both left-hand and right-hand. Matte box and top handle grip bracket can be also work seperately. Fits standard 15mm supporting rods. Height of it can be adjusted by 3.5cm through release and lock the 2 screws by side. Two filter trays, supporting 4"x4" filter.One is about 90-degree rotatable,which will be helpful when you use gradual ND filter. 4pcs different size donuts included.(103mm,76mm,64mm,51mm). It is used to avoid large gap beside lens.