The kit comes in a plastic bag coated with preservative oil and a desiccant bag. The blades have been cleaned of rust. Thickness is accurate when measured with a precision caliper with a caliper tolerance of 0.0005 inch or 0.0127 mm. The only issue I've found that doesn't bother me is that the curves don't line up exactly. But the blades are still in place. Recommended as an excellent general purpose feeler gauge/thickness gauge.
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