I purchased it without confirming the total length, and there was length other than it. I regret that I should confirm that there are inconveniences in a small place. I can use it without problems in a wide place.
Although I am using 17, 19, 21 mm for about 2 years, it is good, although it is used with the impact of 14.4 v, the hexagonal axis is not broken as well of course without the smoothness of the nut. The swallowing of the bolt is also deep and there is nothing that was not shut by ordinary use.