Passage Function: Passage door hardware has no locking mechanism. Both the interior and exterior handles are always free making it perfect for hallways, closet doors, and anywhere else a lock isn't needed. Passage door hardware can also be used in conjunction with a deadbolt to secure a back door or entrance. Features High quality, durable solid brass construction Suitable for right or left handed applications Manufactured in the United States Covered under a 5 year finish and 5 year mechanical warranty Specifications Backset: 2-3/4" Cross Bore: 2-1/8" Edge Bore: 1" Door Thickness: 1-3/8" to 1-3/4" Handing: Reversible Knob Diameter: 2-1/4" Material: Brass and Crystal Projection: 2-3/16"