The OConnor Universal Ring 150-80mm is an aircraft grade aluminum donut ring for the OConnor O-Box Mattebox. It features a high-tech composite flex material that seamlessly supports any lens from 134mm to 80mm in diameter..

• Clamp-On Donut Ring for O-Box Mattebox
• Supports 134mm to 80mm Diameter Lenses
• Aircraft Grade Aluminum Exterior
• High-Tech Composite Flex Interior