Three different holders. Made to fit your sensor. Sensors from different manufacturers differ slightly in size. Width, length and thickness vary. That is why we chose to custom make the claw size to ensure a perfect fit. TrollByte Kimera is made in slightly different sizes and tested to suit a variety of sensors, currently we have tried out a little over one hundred sensors. When choosing a TrollByte Kimera for your sensor, you can be sure that it will fit perfectly.