EC&trade; Articulating Magic Friction Arm Small Super Clamp Crab Pliers Clip For Dslr rig LCD Monitor Rig Clamp Mounts onto anything like cameras, lights, umbrellas, hooks, shelves, plate glass, cross bars, even other Super Clamps This Super CoolClamp was made of lightweight Aluminum Alloy Coming with screws of 1/4 and 3/8 Help lighting engineers or photographers fix their accessories more easily Grip size is up to 5cm,Be able to fix onto any tubes coming with size from 1.2-5cm