The Bounty Hunter (R) 4" Gold Nugget Accessory Coil features a narrower field of detection which makes it ideal for prospecting in tight spots. This accessory coil is compatible with all Bounty Hunter (R) intermediate, advanced, and professional metal detector models (excluding Tracker II). FEATURES: Narrower field of detection ideal for prospecting in tight spots Compatible with all Bounty Hunter (R) intermediate, advanced, and professional metal detector models (excluding Tracker II) Diameter: 4" Model: 4COIL