Get 2 9mm agar punches that are hand-made and made to order. They have an inner dimension of 9mm. Perfect for getting a sample and making it look uniformed and professional. The punches are made in a way that you can take it apart and back together easily. They are also made from stainless steel and therefore are safe to sterilize. Just take apart and put into a sterilization envelope and PC for 30-45 minutes.