The Nokta Makro Simplex 11" DD Search Coil (SP28) is a replacement search coil for the coil that ships with the Nokta Simplex metal detector Series. This double D coil provides excellent ground coverage and depth. You can always select the best search coil for your environment. Achieve the best performance in a variety of areas. This is the Standard coil that comes with Simplex detector models. Includes coil cover and hardware.