Perko Surface Mount Lock for Smooth and Carpeted SurfacesThe 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 2-1/2 diameter hole. The T-Handle drops down flush in either the open or closed position (180 rotation)(unless the offset cam bar is positioned upward). There is a rubber seal and boot under the T-Handle that seals the lock cylinder to prevent water intrusion. Specifications: Mounting Hoe Diameter: 2-1/2"; Face Plate Diameter: 3"; For Mounting Surfaces: 1/8" - 3/4"; Click here for Perko Surface Mount Lock for Smooth and Carpeted Surfaces installation instructions.