This corner rounder is easy to use. Just place the edge of the paper in the slot and press. A nicely rounded corner appears. I've tested this a few times to make sure the rounding is consistent and the map doesn't look colossal. It worked perfectly every time. A good price for a device that does what it is advertised to do. 10mm is ideal for greeting cards, manuscript covers and the like. If you are not sure what size you need as a greeting card maker, try 10mm first.
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