The Roll Bar Mount, co-developed by Contour and RAM, was built to attach your Contour to motorsports roll-bars. Capture race, drift, and off-road action. Using a double socket arm and ball design it adjusts by turning a central wing nut that gives you almost infinite rotation to achieve perfect shooting angles. The marine grade aluminum mount attaches securely and easily via a bonanza strap to round bars from 2? to 3? in diameter.