Corbin Russwin UT5255 Pre-Assembled Unit Lockset Classroom Function, Conventional Cylinder L4 Ked Random, [2] Change Keys, 2 3/4 Backset, 4 7/8" ASA Strike. Handed 

• Handing Specify hand. All functions are handed.
• Door Thickness 1-3/4" (44mm) only.
• Backset 2-3/4" (70mm) only.
• Lock Chassis One-piece investment cast frame. Machined internal parts of steel, bronze and stainless steel. Zinc dichromate for corrosion resistance.
• Front Beveled 1/8" (3mm) in 2" (51mm).
• Latch bolt Brass, chrome plated, 3/4" (19mm) throw pivoted, swinging type.
• Auxiliary Latch Deadlocks latch bolt, preventing manipulation when door is closed.
• Strike Wrought brass or bronze, ANSI strike with nylon adjusting screw, standard. 4-7/8" (124mm) x 1-1/4" (32mm) x 1-1/4" (32mm) lip to center. Optional strikes and lip lengths available;
• Cylinder Brass, 6-pin, L4 keyway, Keyed Random
• Keys Two nickel silver standard. 
• Federal Meets FF-H-106C. 
• UL-cUL All locks listed for A label and lesser class doors, single or pair, maximum door size 3'8" (111.7cm) x 7'2"(218.4cm) All locksets also listed for B label 
• Warranty One-year limited.