THE CASKET KEY Based off a replica of an 1800s Coffin key. what is a casket key? Or coffin key? A casket key is a tool used to lock or unlock a casket, particularly those with locking mechanisms. The key engages with the casket's lock, usually located on the side or front, and is used during funeral services to securely close the casket before burial or transport. The locking mechanism ensures the casket remains sealed. • comes on a 26 inch silver satellite chain, pendant is approximately 1.5 inch (*Please review our policy page before placing your order.)