Does your dog stray? The Ancol Brass Dog ID Tube is easy to fit and can help to identify your dog if they stray or are lost. Simply unscrew the 2 parts of the barrel and remove the paper insert. Write your name and telephone number with a permanent felt tip marker pen, then replace the paper insert into the barrel and screw base and top together, ensuring the base is securely tightened. Can also be used to identify luggage or keys. Measures approx 3cm long. Handy hint: use nail varnish to seal unit together securely.