4040XP Heavy Duty Surface Mounted Door Closer - Regular Arm with Parallel Shoe - Aluminum FinishLCN 4040XP Heavy Duty Surface Mounted Door Closer Regular Arm with Parallel Shoe Aluminum Finish This heavy duty closer is LCNs most durable surface mounted closer, designed for the most demanding applications. And now, external enhancements make installation and maintenance faster and more accurate. While the internal design remains unchanged, providing the same quality, reliability and durability for which the 4040XP cast iron closer in well known.