Synergy® Series Commercial Mortice Locks A range of high security cylinder mortice locks and latches suitable for heavy duty use in industrial and commercial applications. Lockwood Synergy® 3570 Nightlatch Mortice Lock60mm, 89mm or 127mm backset models available. Lockwood Synergy 3571 Mortice Deadlocks60mm, 89mm or 127mm backset models available. Lockwood Synergy 3572 Vestibule Mortice LocksAvailable in 60mm, 89mm or 127mm backset. Lockwood 3573 Sliding Door Mortice Deadlocks60mm, 89mm or 127mm backset models available. Lockwood 3574 Combination Mortice Latches60mm, 89mm or 127mm backset models available. Lockwood Synergy® 3577 Dual Entry Deadlatch Mortice Lock60mm, 89mm or 127mm backset models available. Lockwood Synergy® 3578 Hold Back Deadlatches60mm, 89mm or 127mm backset models available. Lockwood Synergy® 3579 Series Mortice Locks and Deadbolts60mm backset. Lockwood Synergy® 3540 Short Backset Mortice Deadlock23mm backset models available. Lockwood Synergy® 3541 Short Backset Mortice Hook Bolt23mm and 30mm backset models available. Lockwood Synergy® 3542 Short Backset Mortice Hook Bolt23mm backset models available.