Articulating Magic Metal Friction Arm Large Super Clamp Crab Pliers Clip for Holding LCD Monitor/DSLR Camera/ DV Articulating Magic Metal Friction Arm Large Super Clamp Crab Pliers Clip for Holding LCD Monitor/DSLR Camera/ DV Usage: Can clamp types of tubes, and coming with 1/4, 3/8 Screws The screw can also be fixed with Ball-head or Reflective umbrellas joint, which can help the lighting engineers or photographers to easily install their lighting or photo accessories. Help lighting engineers or photographers fix their accessories more easily. Be able to fix onto any shaped body such as: water pipes, handrails, doors, shelves, tables, branches, wires, etc.