I've been trying to improve my carpentry skills and got tired of driving just one screw with maximum force to make it "drown" (I never said I just came to myself to improve). I bought a combo set to drill and ream at the same time, but was never satisfied with the three bit combo. I've looked at many options, but not too many with glowing reports. I stumble upon this little beauty with 5 grooves for a thin smooth wall with a hole countersink. I first had to get used to the fact that no strong pressure is needed with oak either. Now I can countersink with the best bit and size of my choice. Great article! Made in the USA. Very versatile with little effort. It's easy to get consistent results with a little practice.