The S. Parker B2635PBKD entry lock knob features cylindrical construction, providing keyed access for residential or light commercial doors. This lock is rated ANSI/BHMA Grade 3, indicating basic security and durability suitable for standard residential use, with latches tested for up to 250,000 cycles. It incorporates an SC1 keyway, also known as Schlage C, for broad compatibility. The design includes an adjustable backset, typically fitting 2-3/8" to 2-3/4" preparations, and is suitable for door thicknesses from 1-3/8" to 1-3/4". The lock housing and chassis are constructed from cold-rolled steel with a zinc dichromate finish for corrosion resistance, and it presents a bright brass finish. Installation requires a standard 2-1/8" bore through the door.