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What is the exact width of each file?

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The smallest is 0.39 mm. The largest is 0.45 mm.

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What’s the catch with the lifetime warranty?

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Lifetime warranty covers the sawing surface. It will never wear out or wear out. Does not apply if the nail file suddenly breaks. Whatever one may say, they are made of glass

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Do I need to pay extra for the file cover?

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No, the covers are already included in the file price. All files are delivered in a velvet or plastic case.

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Are both sides the same grain, or is one side rougher than the other?

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Both sides have the same grain size.

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Do these files add shine to your nails?

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We would not recommend using them to polish the nail plate. They are more intended for smoothing the edges of the nail. Use a buffer to add shine.

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