Crab clamp (option)

 The two most common thread sizes are 1/4"-20 and 3/8"-16.

1. 1/4"-20 Thread:

   • This is a standard thread size with a diameter of 1/4 inch and 20 threads per inch. It's widely used in photography and videography equipment. Many tripods, camera plates, and accessories feature a 1/4"-20 thread.
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2. 3/8"-16 Thread:

   • This thread size has a diameter of 3/8 inch and 16 threads per inch. It's also commonly found on tripods and heavier-duty camera support equipment.

The AIR³ Crab clamp includes these two types of hole.

The Crab Clamp can be attached to tubes up to 54 mm in diameter.