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COIL Commander 18" round monoloop GP Minelab Minelab Commander coil 18" (45 cm) round monoloop. Search coil for MInelab GPX, SD and GP series (old models). This research plate 18 "monoloop is the best of the Commander series for search depth. It is not sensitive to small gold nuggets, but has a great ground cover and detects in gold targets at greater depth.