This double cylinder deadbolt is operated by a key on both sides.

Operated by key outside and inside. Security deadbolts feature full 1 in solid core throw bolt, all metal mechanisms, anti-pry shield and pick-resistant 5-pin system. Door prep 2-1/8 in crossbore, 1 in edge bore, 1 x 2-1/4 in latch face. Backset adjustable 2-3/8 to 2-3/4 in. Thk doorness fits 1-3/8 to 1-3/4 in doors. Cylinder 5-pin. Faceplates of 1 x 2-1/4 in round corner. Strikes of 1 x 2-1/4 in round corner. Bolt 1 in throw. Reversible for right or left handed doors. ANSI/BHMA Grade 3.

Operated by key outside and inside. Security deadbolts feature full 1" solid core throwbolt, all metal mechanisms, anti-pry shield and pick resistant 5-pin system. DOOR PREP: 2-1/8" Crossbore; 1" Edge Bore; 1" x 2-1/4" Latch Face. BACKSET: adjustable 2-3/8" to 2-3/4". DOOR THICKNESS: Fits 1-3/8" to 1-3/4" doors. CYLINDER: 5-pin. FACEPLATES: 1" x 2-1/4" round corner. STRIKES: 1" x 2-1/4" round corner. BOLT: 1" throw. HANDING: Reversible for right or left handed doors. ANSI/BHMA: Grade 3.

Kwikset Signature Deadbolt, Double-Sided, Security Grade: 2, Number of Cylinders: 2, Cylinder Type: 6-Pin, Keyway Type: KW1, Re-Key Technology: SmartKey, Strike Type: Round Corner, Strike Size: 2-1/4 in H x 1 in W, Backset Type: Adjustable, Backset Size: 2-3/8 to 2-3/4 in, Latch Type: Round Corner, Faceplate Size: 1 x 2-1/4 in, Throw Length: 1 in, Cross Bore Diameter: 2-1/8 in, Edge Bore Diameter: 1 in, Projection Size: 1-1/8 in, Door Thickness: 1-3/8 to 1-3/4 in, Door Handing: Universal, Commercial/Residential: Residential, Metal, Satin Nickel, Dimensions: 2.6 in H x 2.6 in W x 1.125 in D, Includes: (2) Keys