Garrett 11"X13" DD Coil (ATX)Mono coil provides greatest detection depth in most soil conditions. Garrett exclusive sliding mount design provides the advantages of a center mounted coil (balance, easy tilting). Solid coil design is more resistant to impact. Front half of solid coils top surface provides a large, flat surface to spread a handful of dirt to sift for a tiny nugget. Ideal coil for prospectors and relic hunters for improved gliding scrubbing over brush, rocks, etc.