SmallRig Crab-Shaped Super Clamp with Ballhead Magic Arm 4373 includes a ballhead magic arm, a crab-shaped clamp, an action camera mount, and a phone holder. There is a 1/4""-20 screw on one side of the magic arm for an action camera, monitor, LED video light, microphone, etc. The ball head features anti-slip threads for a firm lock. An anti-twist structure secures the ballhead magic arm to the crab-shaped clamp firm to ensure they do not become loose or fall off while moving. The clamp opens as wide as 54mm/2.1in and is compatible with DJI Ronin, FREEFLY MOVI Pro, and any 30mm rods, with easy adjustment via a knob. The clamp is embedded with pads which effectively protects the clamping object and enhances the stability of the clamping. The entire kit can be used with the included action camera mount to adapt to GoPro Hero Cage 3084C & 3083C, Frame for Insta360 X3 4088B, and Cage for DJI Osmo Action 4119. The phone holder supports 56-86mm wide and no more than 9mm thick smartphones.