Corona has recently released an extensive series of files for sharpening gardening tools (and anything else you can think of). Available both with and without handles, these files promise to make quick work of any sharpening or shaping task. We’ll be using them to sharpen pruning shears and shovels; stay tuned for reviews and videos!
SOURCE:http://gardeningproductsreview.com/coronas-new-files-sharpen-garden-tools/