Wooden Camera UMB-1 Matte Box Clamp On Ring (143-134mm). The 143-134mm UMB-1 Matte Box Clamp-On Ring from Wooden Camera enables you to use your base or swing-away version of the UMB-1 Universal Matte Box as a clamp-on matte box with a lens with a front outer diameter of 134mm.

The clamp-on ring is made from ABS plastic for a combination of strength and durability, and features a split ring design for a secure grip.UMB-1 Universal Matte Box Base and Swing-Away versions.The split ring designs allows the clamp-on ring to compress while evenly distributing the clamping force on your lenses barrel..

• For UMB-1 Matte Boxes
• For lens with 134mm Outer Diameter
• Made from ABS Plastic
• Split Ring with Baffles