high quality Excellent Corrosion Resistance: The rods of the T-handle Garage Door Lock are made of high quality iron with galvanized plating, which prevents iron from rusting and corroding, thus prolonging the service life of iron. The handle is zinc alloy, which also has good corrosion resistance. The key is nickel-plated copper, which has excellent corrosion resistance and can remain stable for a long time in harsh environments for long-term use.Package Includes: 2pcs Garage Door T-Handle Replacement Lock, 4 pcs U.S. standard 10# * 1-1/4 Phillips countersunk head self-tapping screws, each T-handle lock comes with two keys.Basic Functions: This T-Handle Garage Door Lock fits most wood or metal garage doors.Easy Installation: Our Garage Door Keyed T-Handle Lock kit are designed to be easy to install, when unlocking, turn the key clockwise 180 degrees, turn the handle clockwise 90 degrees, when locking, turn the handle counterclockwise 90 degrees, then turn the key counterclockwise 180 degrees.Size: 4" long * 5/16" wide locking rod, US standard 10# * 1-1/4 screws