SONGING 11'' Magic Arm, Stainless Steel Ball Head and Thread, Articulating Magic Friction Arm Adjustable1/4'' Tripod Screw Compatible with DSLR Camera Rig/DV Monitor/Flash Light/Microphone 1. Single locking knob, fast locking and loosening. 2. Independent joints, and the direction of rotation is faster. 3. The upper and lower tooth surfaces fit together to prevent slippage, increase the locking force, and bear a load of ≤10kg. 4. The ball head and thread are made of stainless steel, which is stronger and more durable. 5. 7 inch and 11 inch are optional, and users can exchange accessories of one SY-L7 and one SY-L11 into two SY-L9. 6. Gray electroplating process, the product is more beautiful and non-reflective, suitable for use in various shooting environments CNC Process, Stainless steel and Aluminum Alloy Anodizing.Single Lock switch for simple operation.Independent joint for quick direction adjustment.The tooth surface meshing to prevent slipping.Stainless Steel ball head and thread, stable and durable. One 7 inch SY-L7 and one 11 inch SY-L11 can be freely changed to two pcs SY-L9.