I used it in the exchange of the TOYO sashi of the old house. I was in trouble because the distance to the window did not match at all, but it was resolved by inverting 180 degrees.
I feel that it is different from the correct way of use, but it is one fifth of the general purpose crescent for reform, so there is no complaint. The thing itself is solid.
Due to the structure of the glass window, the receiving side could not be exchanged, it became a combination with the old one, but it could be used by turning the attachment part on the hooking side by 180 degrees.