Purchased for maintenance of machines made in the USA. If I damage the bolt of the machine I also wanted to buy a reliable hexagon stick wrench because I got a regular spare bolt. Rigidity feeling, fitting accuracy into bolt, both were satisfactory. Because this bolt was tightened very tightly, the tool or bolt might have been deformed with a cheap wrench, but this product had a response not to feel such anxiety at all. Hexagon wrench wrench which can be used with such relief is the first time. Great.