It is strong and it can not break. Although there is no problem with the product, evaluation of 4 stars by price setting. In 16, it gets out 5 cm from the box, and the depth to which the pipe is inserted is 3 cm. You will have to leave 2 cm from the claw of the box to the end of the pipe. "No. 2 Connector" and "TS Coupling" are the same names in Nichido Electric Works and Miguro Industry, and their origin is sometimes cared for.