Schlage FB52N V BEL 505 B62 Double Cylinder Deadbolt and F51 Keyed Entry Bell Knob Keyed Alike, Bright Brass finish Double cylinder deadbolt operates with a key on the exterior and a key on the interior Deadbolt features biggest bolt diameter for maximum kick-in resistance and hardened steel deadbolt core that spins to resist saw attacks Knob is field reversible to allow it to be used on both right handed or left handed doors Snap and Stay design on deadbolt cuts installation time in half