The millimeters per cutter are NOT the cutter radius! The millimeter numbers on the label indicate the diameter of the cutter, not the radius. The attached image shows the radius for different sizes. The bit thus corresponds to the standard size in US inches according to the SAE standard. The seller said they would work with the manufacturer to label them correctly. Also, there are no engraved or printed measurements on the barrel. As for cutting, I used the smallest router bit to round the oak and MDF. It worked fine. Left a nice smooth cut and the router bit seemed well balanced in the router.
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