This coil is recognized by detector users as an "optimum" coil size to search areas that larger coils cannot navigate - low bushes, around tree roots, close to metal buildings, sidewalks, etc.
The mono design sends a different shaped signal into the ground seeking coins, rings, jewelry, and other small valuables. The coil can also be used in use in large areas with moderate to heavily mineralized soils to go deeper than the standard Garrett metal detector search coil. It is also fully submersible. One diamond ring find pays for this coil!