Most photographers like the Crab-clamp is because that it can be connected to any small size body even its very thin; The bent clamp can be fixed onto any shaped body such as : water pipes handrails doors shelves tables branches wires hang on the wall (not too tight) etc. 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. Features: 1. Coming with both screws of 1/4 and 3/8; 2. Help lighting engineers or photographers fix their accessories more easily; 3. Large grip size up to 4.3CM. 4. Be able to fix onto any tubes coming with size from 1.4-4.3cm; 5. Be able to fix onto any shaped body such as: water pipes handrails doors shelves tables branches wires etc.