Magic Arm with two ball heads. Stretchable pins on both accessory mounts prevent twisting and ensure safety. A magnetic key at the bottom of the thumb lever is used to tighten the thumb wheels. It weighs only 88 g, is compact, and easy to transport and store. The load capacity is 6 kg. Material: aluminum alloy, stainless steel. The SmallRig Magic Arm with two ball heads (1/4'-20 screws) 3873 is compact and lightweight. Each ball head, with a diameter of 20 mm, features a 1/4'-20 screw and stretchable pins that prevent twisting. The adjustable thumb lever helps secure the ball head at an appropriate angle and comes with a small magnetic key at the bottom to tighten the thumb wheels. Both ends of the ball head clamp have notches that provide more space for flexible adjustment of ball heads and mounted accessories.