Although the length of the threading pipe can be easily cut with a cutter, there is no problem, but since the length of the lid pipe which finally plays the role of the presser cover is a little as long as 1.5 cm, if the bookbinding thickness is not to some extent, I will become stupid. For that reason, it is somewhat difficult for the work to require cutting to an appropriate length. It does not have to be necessary if the thickness is 2 cm or more, but it is not suitable for thin articles.