Buy on Amazon : br br FOTGA DP3000 M1 Pro DSLR matte box with donuts for 15mm rod rail rig 5D II III br br Suitable forwide angle lenses on DV HDV Broadcast 16mm35mm cameras br Compatible with 15mm rod center-to-center rails distance 60mm br Height can be adjusted by 4cm 4pcs different size donuts included103mm76mm64mm51mm br MaterialMade of metal and plastic br French FlagSide Flags Flags provide extra flare reductionThey are quick removable They can be opened to the desired length by using the small knob provided on the flags