Action Mount | 4 Wheel Tabletop Mobile Rolling Slider Dolly Car + Smartphone Clamp Mount + 11" Adjustable Articulating Magic Friction Arm for DSLR Camera Rig, or Smartphone. (Red) UNIVERSAL - Mount System works with any 1/4-20 threaded mount Accessory, or attach universal phone mount to use your phone. HIGH QUALITY - This precise and durable designed magic arm with locking control knobs to release or enlarge the tension which can give all position movement. Parts are high-Strength, high rigidity & precision machining aluminum alloys. WORKS WITH A SMARTPHONE - The universal Phone mount easily screws onto the magic arms so that you can use your phone with this extension kit too. Record video in Portrait or Landscape, or Livestream. WHEN TO USE THIS - Great Setup for attaching your phone or camera to this Wheel Dolly so you can quickly and smoothly record video at the skatepark. Easily adjust the angle to capture any view you want. INCLUDES - High Quality Rail Track Slider with Polyurethane wheels, Universal phone mount (opens to 85mm wide), Magic Arms, Hot Shoe Adapter part, and Crab Clamp Pliers.