1. Applications: . Our Mortise Locks comply with American National Standard Institute requirement (ANSI/BHMA156.13-1994) grade 1, and have been approved/listed by U.L. in accordance with the Standard UL10B, UL10C and UVC7-2 (1997). We provide multiple models applicable for different demand functions; the above picture has following models. The function features of each model are specified as follows. 2. M1416: . Dead Lock-Double Cylinder: . Dead bolt operated by key from either side. 3. M1417: . Dead Lock-Cylinder & Thumb Turn: . Dead bolt thrown or retracted is by key outside or thumb turn inside. 4. M1418: . Dead Lock-Single Cylinder: . Dead bolt thrown or retracted is by key from outside. . No trim on opposite side. 5. M1463: . Engine Room Lock: . Dead bolt thrown or retracted is by key from outside. . Inside cylinder turn retracts dead bolt but cannot project it.