1/4 "I felt that the HEX side was a bit hard, but it is better than a bit easy to get out.
You can also use a bit heavy (long) bit aligned for electric railroads with confidence. The shank of the impact driver is deeply deep and the long bit is locked with the ball without any problem.
Although the price is a bit high, it is advantageous from the cost viewpoint that it is possible to share the electric drama bit with the socket wrench, so it is advantageous to arrange the sockets as a result as a result.
In my case, I purchased a long (150 - 200 mm) hexa bit for electronics and a driver bit to share it with 1/4 "SQ socket wrench.