I ditto Big Tracks. I found one on the internet at about 2/3rds the price of the local big box stores. The unit I got goes to 1/2" (actually 17/32nds) but if need be you can buy the 1/2" to 3/4" adapter or the more expensive model - the base motor units are the same. Just get a second sharpening wheel - though my first, after many, many hundreds of sharpened drill bits is only now starting to work slower. The instructions are a bit hazy, even with an instruction video tape, so you will need to experiment a while. The 135degree angle is seldom needed.