Magic Arm with two ball heads. The 1/4'-20 threaded hole features stretchable pins that prevent twisting, and the NATO clamp ensures the security of the accessories. A magnetic key at the bottom of the thumb lever is used to tighten the thumb wheels. Weighing only 91 g, it is compact and easy to transport and store. Load capacity: 6 kg. Material: aluminum alloy, stainless steel. The SmallRig Magic Arm with two ball heads (1/4'-20 screw and NATO clamp) 3875 is compact and lightweight. Both ball heads have a diameter of 20 mm, with one featuring a 1/4'-20 screw and stretchable pins to prevent twisting, while the other has a NATO clamp that supports cages, top plates, etc. with a NATO rail. 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. There are cutouts at both ends of the ball head clamp, providing more space for flexible adjustment of ball heads and mounted accessories. This item weighs only 91 g, making it easy to transport and store.