The Tilta Clamp-On Adapter for the MB-T12 Matte Box allows secure attachment of the 4 x 5.65 inch matte box to lenses with a 114mm front diameter. Made from aluminium and stainless steel, it features a circular inner design with a rectangular outer frame and uses keyhole slots to connect to the matte box. The thumbscrew clamp ensures a stable fit directly onto the lens barrel.