The FireKing Hercules Book Safe with Concealed Key Lock, you can store your valuables in your home, RV, or office. It has a hidden key lock to keep small electronics, jewelry, credit cards, passports and cash safe and secure. Constructed of heavy-gauge steel, this book safe has a felt-lined interior and is designed to stand up to daily use. Whether you need to protect records, cash, merchandise, time, profits or employees, there's only one name you need to know: FireKing.