Do you need perforating knives?

A customer asked us to manufacture perforating knives in different sizes.
We are manufacturing perforating knives for our machines, so we can manufacture them.

The standard size of our knives is 43mm outer diameter 6mm thickness and 7mm hole.
Now we are going to manufacture some 40mm outer diameter 5mm thickness and 6mm hole.
It'd be more economical to manufacture more knives at once.
Are you interested in such or similar knives?