Sterling Silver Letter Keyring. The 925 Sterling Silver Letter Keyrings are available in the letter of your choice. Each Letter Keyring is sterling silver and approx. 2.5cm (1″) heigh and has a nickel plated split ring. The Alphabet Keyring is fully hallmarked and gift boxed. Made by our silversmith in the UK. Please note the Sponsor Mark has been obscured for privacy reasons.