Drill bits don't need to be replaced if they've gone dull, as there are multiple ways to re-sharpen them so that you can get ...

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Bver tried to cut something with a pair of dull scissors? How about shaving with an old razor? Cutting or trimming with anything that isn't as sharp as it's meant to be is no fun-and the same goes for ...

I've been thinking about buying one of these but I don't know if they are just a gimmick. Also, if they genuinely work well how good do your bits need to be in the first place to be worth sharpening?