There was a chance to use after about 1 month after purchase, so there was a deep scratch on the place to chuck when trying to open it. After purchase, after 2 weeks it seems that return is impossible so if you ask the manufacturer to exchange, "If you purchased at a regular trading company, you can respond to a return or exchange, but monotaro can not do" . After all, because it was a limited express item, I finished with boring processing. It was just iron waste. Is there a merit that the user buys up to risk? I will learn anger without a visit. It seems to be better to be careful about monotoro which is not returnable.