The bit itself is vulnerable to rust, rust comes up just by using it for a day. After a week there was lots of rust. We do a lot of work to do in front of customers and we think that the "beauty of tools" that is well-maintained as well as well as being good as quality. It is unsuitable for such work. Also, the magnetic force of the magnet is weak halfway.
Tex striking to the steel frame is exhausted because the tip of the bit is missing. This price is appreciated as we use five, six in the day's work. Although I tried variously, the strength against the chipping of the bit tip is not much different from any manufacturer, and there is the greatest attraction at the price that can be used by dividing it as "expendable item".
If you do poorly at the time of driving the screw, you will crush the head immediately, but if it is present, it seems that it can be prevented somewhat. However, I will crush my head after all, so I do not think it is a magical drill bit. It is considerably cheaper than buying at home center, so it is recommended for those who are interested.