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6" coil size is best for locating older, more valuable coins in areas that have been searched by detectors with larger, standard size coils (8 - 9 - 11 - 12 inch). 6" coils can work around trash and see missed coins. Rings and jewelry that are difficult to find when using larger size coils are more likely to be found, and smaller size coils can work closer to metal buildings, chain link fences and sidewalks. 6" coils are another tool for better treasure hunting.