NEL Thunder 14.5" x 10.5" for Garrett AT Max Series Metal DetectorsCoil Thunder is the latest development that combines high levels of detection depth and selectivity. Working with a slow swing will maximize its ability in finding not only large and medium targets but small targets which weigh less than 1g at 20 cm deep as well. The Thunder coil is suited for finding coins, treasures and artifacts in the field of military battles in any territory. Coil Cover Included.