The K5572 European standard blade fireproof lock body is designed to provide reliable fire resistance, smooth operation, and enhanced security for residential and commercial fire-rated doors. Manufactured with durable high-temperature-resistant materials and a precision blade locking mechanism, this fireproof mortise lock body helps maintain structural integrity during emergencies while resisting tampering and forced entry. Its European standard dimensions ensure easy installation and compatibility with various door handles and cylinders, making the K5572 fireproof lock body an ideal solution for apartments, hotels, offices, and public building fire door systems.