Extensive Compatibility : Dual ball heads with magic arm features for NATO Clamp and 1/4"-20 Screws (With Retractable Pins) on the end for DSLR cameras, action cameras, LED lights, flashes, etc. | Anti-twist Retractable Pins : Magic arm with the retractable Pins on each end to prevent twisting. The locating pins are retractable spring designs. You can mount it on the accessories with 1/4" locating holes and NATO Rail or with a 1/4" threaded hole and NATO Rail. | 360° Flexible Adjustment : The camera magic arm with an adjustable thumb lever could be adjusted in different positions and angles via both the ballhead and ballhead clamp. It comes with a small magnetic wrench at the bottom to tighten the thumbwheels. | 12Ib Payload : The max load capacity of the magic arm is 12Ib (5.5kg). Firmly fix your field monitor, LED lights, audio recorders, etc. Each ballhead is 0.79 inch (20 mm) in diameter. This item weighs only 0.2 Ib (91g) , making it easy to carry around and store. | Durable and Stable : The magic arm holder is made of CNC-processed aluminum alloy and stainless steel, which is durable. The ball head with rubber rings is more stable. The rubber pads on each end protect your device from scratching. | Notice: Please note that the diameter of the ball head is 20mm and will NOT fit other brands clamps.