Slim Recessed Mounted Aluminum Letter Box with Commercial Lock Beaumont Corrosion Resistant Finish: Zinc plating helps Item Weight:.625 Corrosion Resistant Finish: Zinc plating helps protect against rust in indoor and covered outdoor uses Parallel Grip Design: Maintains a consistent hold for reduced slippage Specification Details Material Extruded aluminum Finish Durable powder coated finish Unit Size 11" W x 19" H x 3 1 2" D Rough Opening 9 1 2'' W x 17 3 4'' H x 3 1 2'' D Mail Slot Size 7 1 2" W x 3 4" H Door Thickness 1 4" thick aluminum Lock Type Commercial lock (with 2 keys) Mounting Fits into a rough opening and secured with mounting hardware (not included) through the back or side panels Flanged Collar Fully integrated flanged collar fits over the rough opening Frequently Asked Questions (FAQ): Q: Does the letter box come with a lock