Blunt lawn mower blades don't just make your lawn look scruffy; they mash the ends of the grass rather than slicing it cleanly, making it easy for diseases to get in. So as soon as you notice signs that your lawn mower blades need sharpening, it's a chore that needs to go to the top of the list. Although there are lots of ways to sharpen lawn mower blades, either with power tools or by hand, the Tarist Diamond File Set currently available from Amazon for $19.99 is well worth considering. It will tackle your mower blades surprisingly quickly and offers versatility that few alternatives match. As a result, the flat file will make short work of sharpening all kinds of lawn mower blades.