I am a 70-year-old female with NO concrete experience. I am installing rubber "curbs" in my driveway that need to be bolted down. I went to Home Depot and they helped with the hardware to use. They suggested I get a hammer drill. I said I wasn't about to spend more money on the hammer drill than I did on the curbs. They said it was possible to use my regular drill but I would be at it for hours and may ruin my drill. I finally made it through about 1/4". I decided to go get a hammer drill. Ha! Knowing I would not be using it for much concrete drilling if any, I decided to get a cheap one. I went to Harbor Freight and purchased the Bauer 1792C-B1 20V HyperMax Lithium 1/2" compact hammer drill kit for $69.99. I will say I believe it will succeed in hammering the four 3/16" holes, about 2" deep. I also believe if I knew what I was doing it would go smoother. Easier. Faster. I have made a hole an inch or so deep. The battery keeps coming off. The vibration is massive. The torque selector goes from 1 to 21. I have NO idea how to use this or how to tell if it needs adjusting when I am drilling. The directions suck big-time! Even if they wrote them with experienced users in mind, instead of someone that knows nothing, they are still inadequate. I put it on the fast speed. I always thought that switch was a torque setting. From what I'm gathering, it is just a fast and slow switch. Putting it on slow seems to do nothing. Can someone please explain the actual 1-21 torque ring and how to use it? Does it have anything to do with the vibration? I believe the battery is vibrating right off! It has disconnected several times while hammering. If I can figure this out to where it is not such a pain, I just might find more concrete to drill and larger capacity batteries! I read where a 2" deep hole should take about a minute. That would be outstanding! Not that I expect that. I'd just like to get this done without taking hours! Thanks!