I LOVE THIS DRILL! I did a lot of research before deciding on this one. I'm a DIYer so I won't be using this commercially. What can I say, this "baby" does its job well. I am building a 30' x 50' garage and need to drill about 50 7/8" holes in 10" deep two week old concrete. I didn't try a single 7/8" bit. I started with 5/16" and worked my way up to the final size with ease. It was bone-hard work, which I spread over several days, and which of course was made easier with the right drill and drill combination. Don't skimp on the bits, I made a "fishhook" out of an inferior 5/16 bit. Only downsides: Knob for setting #1 or #2 on the side (barely visible in the standard photo, black, right in front of the Milwaukee label) loosened inside. It still works, but now the virtual numbers are at the 1 and 7 o'clock positions and not the real 3 and 9. As you might expect, hard work causes a lot of heat to build up in the drill. It was very hot to the touch as I had to touch the "black" area to replace the bits. The "red" areas stayed relatively cold.