Great residential door knob replacement Solid brass cylinders ANSI Grade 3 rated door knob. Polished brass finish. Fits doors between 1 3/8 to 1-3/4" thick. 2-3/8" to2-3/4" adjustable backset Kwikset keyway. ANSI Grade 3 Flexible Installation: Six-way adjustable latch, fits 2-3/8 in. or 2-3/4 in. backset, square, rounded corners, or drive-in Use with 1-3/8 in. to 1-3/4 in. Door