Buy Metal Core Wheels Where Can I Go To Buy Metal Clasps For The Corner Of Old Books?

Where can I go to buy Metal Clasps for the corner of old books? - buy metal core wheels

I'm writing a book that I look old, and I saw a lot of books online with closures for the corners. I like the look of them, but I do not know where to buy, so you then put it in the book that I am doing. Who knows where to look?