With its truly unique design, this lock is reinforced in just about every way possible. From a UL437 Listed Cylinder, to strong latch, to Bolt Bearing Mechanism, the Hercular Deadbolt will stop almost any attempt at forced entry. Strength doesn’t usually mix with flexibility, however that’s not the case with the Hercular Deadbolt since it’s the only Grade 1 Deadlock with an adjustable bracket.