The RIDGID 97852 85 mm Pipe Guide for the SeeSnake Standard fits a 35 mm camera head. The ball-type centering guide uses two retaining rings that hold the guide in place on the spring. It is designed to help center the camera in pipes, keeping the camera clear of bottom sludge in the pipe. By bringing the camera head closer to the center of the pipe, the pipe guide improves picture quality, allowing the camera to see equally in all directions and helping to keep the camera lens clear during inspections.