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Q What's the difference between a file and a rasp? -JIM BELCHER PORTLAND, OREG. A It's easy to confuse the these tools because of their simllar sizes and shapes, but they have very different functions. Files (4-9 below) have tiny rows of ridges and peaks just the thing for smoothing or sharpening metal Rasps (1-3) have hundreds of individual teeth, which are meant to shape wood A file can be used on wood too if you don't mind how slowly it works But don't trun a rasp over metal—you'll dull the teeth and ruin the tool.
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