Review on Dremel 663DR 4 Inch Glass Drilling by John Swain

I have never used a drill this size, only 1/8 inch. I used a dremel workstation to get a nice hole. you stay a little cool I use a spray bottle filled with water. (I have 6 corded 3000, 8220 and 7300 battery operated plus a workstation, a multi vise, 2 flex shafts and almost all dremel bits and anything with a 1/8" shank. I didn't buy a 4000 mainly because it even so is heavy, expensive and didn't require power.The only 2 attachments I don't like are the shield (just outside the shield, no shield and fan. You can blow harder than it! Always wear eye protection!