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The door thickness should be 35mm~55mm. This item is suitable for doors below: - Door Frame/ material: Wood (Steel door is not recommended) - Crossbore diameter: 38mm or 54 mm - Backset (distance between center of crossbore hole and edge of door): 60mm or 70mm - Diameter of door hole: 25mm - Location of handleset or bored dead latch : >150mm from crossbore hole. Please pay attention to the outer dimension. If you have any further questions, please feel free to contact us via [email protected] or call us at +1 (800) 988 7973.
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