The 12COILDD is the deepest and lightest large coil made for First Texas Products metal detectors (Fisher, Teknetics, and Bounty Hunter). The 12COILDD is a fully submersible, waterproof epoxy-filled coil designed for use on land or in the water. It performs well in mineralized and non-mineralized soils and is equally good on small and large targets. This coil is an all-purpose deep seeking searchcoil recommended for coin and jewelry hunting, relic hunting, and beach hunting. COMPATIBLE FISHER MODELS: F11 Fisher F11, F22 Fisher F22, F44 Fisher F44, F5 Fisher F5, F5-11DD Fisher F5 with 11” DD, F19 Fisher F19, GOLDBUG Gold Bug Metal Detector, GOLDBUG-DP Gold Bug DP Metal Detector, GOLDBUG-PRO-CC Gold Bug Pro Combo