The Powerful Garrett 5″ x 8″ DD Coil is made for the “ACE Series Metal Detectors including the ACE 400, ACE 300, and ACE 200″ Metal Detectors. The New Garrett 5″ x 8″ DD Search coil is Great at Separating Targets that are close together and is Ideal for Searching those targets in tight search areas. It’s Long Narrow Detection field provides Excellent Scanning Coverage compared to Concentric designed coils. The “DD” Configuration provides Greater Detection Depth and Performance by ignoring most of the Negative effects of Heavily Mineralized Ground and Saltwater interference. It’s Blunted tip and tail design further extends the coils total scan area and offers Improved Searching along obstacles. The Design of the 5″ x 8″ DD Coil Provides Excellent Ground Visibility with it’s open Coil design. It’s also Waterproof so you don’t have to worry about water damaging your coil when immersed.