I feel a sense of twisting when I hit a torque for a long time. It is fixed to the BOX with a freshwater screw and can be replaced with a different size, but it is easy to loosen the bamboo thread and loosen it with play. I do not feel the necessity of replacing in the first place. A good story if you prepare for each size. BOX integrated type is easier to use. I will not buy it anymore.
Purchased for maintenance of mountain bike. I used it for attaching / detaching a screw which does not reach even with long sized L wrench. (The distance to the screw is 200 mm !!) Thanks to this extension bar it has made it easier to work.