Review on CO Z Large Spiral Groove Drill by Ryan Lawson

I bought this to drill a 2" hole in .185" thick aluminum and was looking for something that I thought would improve the smoothness of cut and dimensional stability over the hole saws I use. (I have smaller pitch drills from another manufacturer that do just that.) This drill could not effectively cut a 2" hole in .185 aluminum. I used a drill press at the right speed and cutting oil as I did with the smaller step drill bits that worked so well. I ended up wasting my time and money on this product.