M1 Matte Box Used for Video/Film Making by DSLR Camera or Camcorders Comes with 77mm Maximum Caliber, Compatible with all 15mm Standard Video Supporting System This Matte Box could be adjusted the height (up to 45mm) according to the lens of camera on the rail rod system Top and flank barn door are easily adjustable the angle to meet you; and removable,convenient to carry Made of aluminum (mostly anodized black), ABS, and rubber , it is excellent for your daily use 100% brand new and high quality and cheap Color: Black with blue knob