Function:
MK11=Entrance/Office
MK12=Storeroom
MK17=Classroom

Door Thickness: 1-3/8" (34.92 mm) to 1-3/4" (44.45 mm).
Backset: 2-3/8" or 2-3/4"
Lock Chassis: Cold rolled steel with zinc dichromate finish for corrosion resistance. Requires standard 2-1/8" (53.97 mm) bore through door.
Latch: Brass with 1/2" (12.7 mm) throw. Latch housing is steel, with zinc dichromate finish for corrosion resistance. 7/8" (22.225 mm) bore in edge of door is required.
Latch Front: Brass or bronze. Standard faceplate for 2-3/8" (60.32 mm) backset measures 2-1/4" (57.15 mm) x 1" (25.40 mm), with a flat front, for 2-3/4" (69.85 mm) standard faceplate measures 2-1/4" (57.15 mm) x 1-1/8" (28.57 mm), with a beveled front 1/8" (3.17 mm) in 2" (50.8 mm).
Strike: Brass, bronze or stainless steel. Standard “T” strike measures 2-3/4" (69.85 mm) x 1-1/8" (28.57 mm). All strikes have a 1-1/4" (31.75 mm) lip to center dimension.
Certification & Compliance: ANSI/BHMA A125.2, Series 4000, Grade 2