1/4 Inch Screw: With 1/4 inch screw, strong compatibility, can be installed on the camera cage or other equipment with 1/4 inch screw holes. Aluminum Alloy Material: Made of high quality aluminum alloy material, CNC process, hollow design, sturdy and durable, providing you great using experience. Product Size: Product diameter is about 5.7cm / 2.2in, height is about 5cm / 2.0in. Exquisite workmanship, beautiful appearance. Small and lightweight, easy to store and carry. Anti Slip Pads and Spikes: Comes with non slip pads and safety spikes to prevent scratches and accidental slips. Can be quickly disassembled and assembled through the knob. 3/8 Inch Screw Hole: The periphery is designed with 3/8 inch screw holes and for Arri positioning holes, which can be used to expand other shooting equipment and enrich shooting needs.