SmallRig Magic Arm with Dual Ball Heads (1/4”-20 Screw and ARRI locating Screw) 3874 is compact and lightweight. Each ball head, 20mm in diameter, features stretchable pins that prevent twisting. The adjustable thumb lever helps secure the ball head at an appropriate angle and comes with a small magnetic wrench at the bottom to tighten the thumbwheels. At both ends of the ball head clamp, there are notches that leave more space for flexible adjustment of ball heads as well as accessories mounted thereon. This item weighs only 90g, making it easy to carry around and store.