I'm guessing that what you call "biscuit", is what we call cookie? Do a search on Google for "springform" pan in the size you are looking for. They are round and make it much easier to un-mold your cheesecake. BTW, welcome to DC!
Thank you for the help, But what I'm looking for is not a spring form. I'd like it to have a hole in the middle, sort of like a donut. But the cookie thickness to be only about 1/2 cm or 1/5 inch
Thanks, but I'm looking for one with bigger hole and Nora's much cookie. I know this a long shot and I've contacted a blacksmith, who might be able to help me with my problem