I use 2 1/2 X 2 1/2 x 1 3/4 opening. I also have 2 1/2 x 2 1/2 x 2" opening which I throw away. Which do you consider Crown size? The 2" opening was used by my brother in law for his Silver Strike Collection. I am reusing his 12 place pages for most of my chips. Sure has saved me some bucks.