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Request a quote · +16042279083 → Inquire online →THB-415 is a two-point lock that enhances the security of double door installations. When the deadbolt is actuated, the bolt extends in to the threshold. Three point locking is achieved when a Threshold bolt is used in conjunction with a header bolt. Throw: 11/16″ (17.45 mm) Cylinder Height: 34″ (863.6 mm) - When the deadbolt is actuated, the bolt extends in to the threshold. Three point locking is achieved when a Threshold bolt is used in conjunction with a header bolt. - Adjusting to cylinder height below 53” (1346.2 mm) can be accomplished by cutting threaded rod - Attaches to the rear of the pivoting deadbolt - Easily add to an existing installation - Rod is zinc plated steel