Callan Model 210S - Grade 3 Double Cylinder DeadboltDouble Cylinder Function:Double cylinder deadbolts are keyed on both sides of the door and are only locked and unlocked via a key. Often times they are used on doors where glass is near the door that could be easily broken and the thumbturn on a standard single cylinder lock would be accessible. Caution: Double Cylinder locks can pose a safety hazard in times of emergency due to requiring a key to unlock. Please check local codes before installing.Caution:Double cylinder locks on residences and any door in any structure which is used for egress are a life safety hazard in times of emergency and their use is not recommended. Installation should be in accordance with existing codes only.Features:Meets BHMA security grade 3 requirementsMade of durable zincFully reversible handing for left or right handed applicationsDesigned for an easy one person installationComes standard with a round corner latch faceplate and 1" throwIncludes a limited lifetime warranty on mechanical parts and a five year warranty on finishSpecifications:Backset: Adjustable 2-3/8" or 2-3/4"Cross Bore: 2-1/8"Edge Bore: 1"Door Thickness: 1-3/8" to 1-3/4"Handing: Reversible Left or RightDiameter: 2-1/2"Projection: 15/16"Latch Faceplate: Round CornerCylinder: 5 Pin KW1Concealed Screws: NoMaterial: ZincTechnical Specification Download