The YHM 6-inch Picatinny Rail Extension adds an extra mounting surface to any Picatinny rail, elevating the mounting surface by 1/2 inch. Constructed from aircraft quality aluminum, this rail extension is hardcoated to military specifications for durability.Key FeaturesElevated Mounting Surface: Raises the mounting surface by 1/2 inch for enhanced compatibility with optics and accessories.Durable Construction: Made from aircraft quality aluminum and hardcoated to mil. specs for increased durability.