I like the idea that this tool can be used with my other +18v battery, very handy. Unfortunately, he could have done the job very well. The blade stopped when you used some force to cut through the metal screw. I would say it stopped 8 to 10 times per screw before cutting one of them, I had to cut 6. I ended up returning this tool and buying a cordless Dremel tool. This is the best tool, I have no problems with the exchange.