If used regularly, all drill bits will eventually become worn out to the point where they are no longer fit for purpose, and most can be brought back into service by restoring the cutting edges. The traditional machinist's tool of choice for resharpening drill bits is the bench grinder, though it requires a certain degree of skill and patience to master the technique required to sharpen by hand. Drill bit sharpeners are designed to provide an easy to use alternative, making them an attractive proposition for people with limited sharpening experience. However, they cannot match the versatility of a bench grinder and before purchasing one you should clarify what types of drill bit can be sharpened in it to make sure it will be suitable for your purposes. As well as drill bits, some drill bit sharpeners are also capable of sharpening other tools as well (such as knives, scissors and chisels).
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