Designed specifically to work with your Canon C300 Mark II, the C300 Mark II Helmet for Canon C300 Mark II is a mini cage that securely mounts to your camera with the four included mounting screws. It provides multiple threaded 1/4"-20 and 3/8"-16 threaded accessory mounting holes and accomodates an optional Canon microphone holder. You can also mount an optional riser plate to the front of the unit, which allows you to mount optional rod clamps.