I was working on my Harley Davidson motorcycle and needed a better set of torx drivers. So I went up to Sears and found these. I am very pleased with the design and function. No stripped screws on my Harley!
I have had the ball ends break off, the shafts twist (they look like wrought iron), and the ends round off. These issues may be due to inadequate heat treatment. They also take up a lot of room in my toolbox. I wouldn't buy them again.