This baby has a lot of power. You may be wondering why it stops turning the screw flush when using standard bits. I have a Dewalt bit set with longer shank bits and I tried one of these. Before I could take my finger off the switch, it countersunk the screw about 3/8" into the wood! When driving screws, I find it good to use torx head screws and standard torx bits. The screwdriver leaves the screw about 1/4" below flush and I finish them by hand with a set of torx wrenches.