Manfrotto Twist Grip Micro Four Thirds Low Profile Filter Rim Prevents Low Profile Filter Rim Prevents vignetting with wide angle focal length lenses G lock Ultra: Gitzo has redesigned the G lock internally and externally introducing a new leg locking system: G lock Ultra Its sturdy and secure aluminium body and high quality construction is fully Made in Italy and ensures smartphones are reliably supported while shooting pictures and videos: the twist movement and the locking knob securely block the smartphone in the right position in just a few easy steps Its ¼” thread support connection and cold shoe lighting connection give you the possibility to use TwistGrip in multiple configurations and with different photographic accessories that will help you always achieving the best shooting results