Since the hall of the outside wheel is narrow, in many cases it can not be turned even with a socket called thin type, but this product can be used almost without problems. Anyway, it is best to insert it directly into the impact of 12.7 mm without the conversion socket.
There is no interference to the wheel with a thin mouth. It can also be used as a 12.7 mm socket, and it seems that it can be used with a 21 mm wrench. I think that it is one that I can recommend to individuals.
The cost performance is also high, it is super-thin type so it is good without hurting the wheel. The length was also exactly good, and there was no rattling and it was possible to use with confidence.