The Schlage Plymouth Design Commercial Cylindrical Lock Door Knob is a part of the D Series of Schlage's cylindrical locks. These knob locks are of an extra heavy duty commercial grade quality. It can be applied to residential, commercial, industrial, or institutional buildings. This includes the doors of retail stores, governemtn facilities, hospitals and religious buildings. Certified Grade 1 by ANSI, these door knob locks are designed for the heaviest use.
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