Perko Black Surface Mount Flush Lock with Keys The Perko Flush Lock and Latch comes complete with two keys. This Flush Lock features a Polymer body with a zinc alloy handle and stainless steel stem and lock nut. Perkos 0931 Series locks are designed to be mounted through doors from 14 inch to 1-18 inches thick. The cam bar is adjustable to a maximum of 3 inches from the mounting surface. Includes flexible strike plate. Key Features Includes two keys Detents indicate open or closed position Offse