In masonry or metal, you'll get a lot of noise ... For those on a limited budget, sharpening drill bits by hand is also an option. All you need is a vise ($33 at Home Depot) and a flat file ...

If that bit is dull, the quality of your work will suffer. If you start to notice imprecision in your router cuts, it's probably time to sharpen the bits. Thankfully, sharpening a router bit is a ...