UMB-1 Mattebox Clamp On Ring (143-134mm) is a clamp on reduction ring for converting the Base or Swing Away version of the Universal Mattebox into a Clamp On version.
Specifications: Weight: 90.7 g (0.2 lbs) Dimensions: 152.4 x 127 x 152.4 mm (6 x 5 x 6 in
