I bought an unused item. Although the thing with a band inner diameter of 40 mm was necessary, it is written as nominal diameter (A) 40, conforming pipe outer diameter (Φ mm) 48.6, which is not clear as to which size is correct, When ordered, the nominal diameter (A) was 46.8 ~ 47.8. If such a description is made, there is a possibility of buying unused items. Please do something. When purchasing, please purchase by looking at the outer diameter of the applicable pipe.