All Drill Bits get dull eventually. I bought a Drill Doctor and it works fine.

The Drill Doctor is extrmely handy when you have only one size of a Drill Bit and it gets dull and you want to complete the job you are doing right now instead of getting in you Car and going to a Store to get another.

However, if you are sharpening a whole box of drill bits you will be suprised that at the time it takes to do all of them.

I bought mine new but there is quite a few used ones sold on eBay.

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84 300D, 82 Volvo 244Gl Diesel