Corbin Russwin DL4111 Mortise Deadlock, Cylinder x Blank Function, L4 Keyway, Keyed Random, [2] Changes Keys. 

Function Cylinder x Blank By key one side only; opposite side blank. DL4100 Series Mortise Deadlocks are Listed for use on fire doors.

Features: 

• Handing: Non-handed.
• Door Thickness: Standard- 1-3/4" (44mm). Optional door thicknesses are available; see Quick Codes.
• Backset: 2-3/4" (70mm).
• Lock case: Heavy wrought steel; zinc dichromate finish.
• Front: Brass, bronze, stainless steel. 4-5/8"(117mm) x 1-1/8" (29mm). Adjustable for flat or beveled doors (bevel adjustment 1/8"(3mm) in 2"(51mm).
• Deadbolt: Steel with a hardened pin; 1" (25mm) throw.
• Strike Standard: wrought brass or bronze, 3-1/2" (89mm) x 1-1/8" (29mm). Optional strikes are available.
• Cylinder: 6-pin, L4 keyway, Keyed Randon. Security cylinder optional; see Quick Codes.
• Keys: Two nickel silver standard.
• Keying Features Available: Master keying; Construction master keying; 7-pin (FC) conventional; Interchangeable core (IC); Security; Security (IC); Visual key control; Concealed key control; Pyramid (FC); Pyramid (IC)
• Warranty: One-year limited.