The LCN 4010 Series Closer is a heavy-duty door closer specially designed to meet the demands of unique mounting applications in high-traffic dwellings. WIth its cast iron body and double heat treated pinion journal, the 4010 is built for smooth operation and long-lasting performance. And installation is made easy with LCN's peel-n-stick templates and patented Green Dial to take the guesswork out of spring force adjustments.