Perko Surface Mount Lock for Smooth and Carpeted Surfaces The Perko surface mount lock is made for smooth surfaces and carpeted surfaces, and includes a gasket for smooth surfaces, and a toothed back for carpeted surfaces. It has a black polymer body with a chrome plated zinc alloy handle, and a stainless steel stem. It comes with 2 keys for the lock, and easily installs into a 2-12 diameter hole. The T-Handle drops down flush in either the open or closed position 180 rotationunless the offset c