Magnetic Phone Holder Base with 1/4 Arri Locating Hole Tripod Adapter for iPhone and other mobile phones. Product size: 65.6*8mm Diameter: 60mm, Product weight: 51.8g, Product colour: black. Adaptability: full range of mobile phones, non-magsafe models can be used with a magnetic phone case or lead magnet ring. Material: Aluminium alloy + PVC, Screw holes: 1/4 screw holes and Arri positioning holes.