With the horizontal bitewing holder, you can use the aiming pin on the holder, the tip of the small pin indicates the center of the sensor or you can use the aiming ring provided. It is the easiest way to get parallel and centered images. you can take twelve x-ray positions; eight posterior PA´s and four bitewings. 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.