Proaim DSLR Kit 3 Shoulder Mount DSLR Rig Matte Box Kit The seller is grantfarek254 and is located in this country US. Proaim matte box sunshade riser plates rails shoulder support kit mb-600 system matte box comes with both 43 and 169 aspect ratios format. Aluminum Front Adjuster with quick lock mechanism. Outer Diameter of this Camera Matte Box is 95mm.