Arrow MK17 Classroom Knob Lock

Arrow MK17 Classroom Knob: Dead locking latch bolt operated by knob from either side except when outside knob is locked from outside by key. When outside knob is locked, latch bolt is operated by inside knob. Arrow's MK Series offers security professionals simple solutions to accessibility requirements. The MK Series designs, architectural finish, and available function options make it ideal for commercial applications where heavy-duty Grade 1 hardware may not be necessary. Features Lock Chassis: Cold rolled steel with zinc dichromate finish for corrosion resistance. Requires standard 2-1/8" (53.97 mm) bore through door.Backset: 2-3/8" (60.32 mm) standard. 2-3/4" (69.85 mm), 3-3/4" (95.25 mm) available.Door Thickness: 1-3/8" (34.92 mm) to 1-3/4" (44.45 mm)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 o