Material: Made of emery, emery is a hard, rough mineral, making the diamond sharpener a fine, natural abrasive used on metal for stripping and rust removal for removing burrs, They make sharpening an easy and efficient task. Assorted Size: Package includes 4 pieces of 5/32" (4mm)chainsaw sharpeners，4 pieces of 3/16" (4.8mm) , 4 pieces of 7/32" (5.5mm). Can be used to sharpen saw chain on both gas and electric chain saws. Application: These burr grinding stone files are suitable for metal polishing like chainsaw, jade, wood, steel, etc. Universal Installation Design: The bottom diameter of burr stone file is 3mm, which can be installed on most electric saw grinders or other rotating tools. It can be used to replace worn or damaged abrasive tools to m.
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