The Bounty Hunter ® 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 ® 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 ® intermediate, advanced, and professional metal detector models (excluding Tracker II) Diameter: 4” Model: 4COIL