For 16mm wide collars we suggest: Small Plate - fits one name + phone number. All on one line of text. 6.5cm long, 1cm wide. For 25mm and up collars we suggest: Large Plate - fits two lines of regular text or three lines of small text. Eg. One name + 2 phone numbers. 7.5cm long, 2cm wide. Buying with a collar? We will engrave and fit it for you. Buying on it's own? We will include rivets for you to fit it to your existing collar.