The Norton 1601689 is an adjustable medium-duty surface-mounted door closer featuring a durable aluminum finish and sex nuts for secure installation. Engineered with a rack and pinion design and valve-controlled backcheck, it provides consistent, reliable door control with adjustable speed settings. This non-handed closer is corrosion-resistant and includes a molded plastic cover for added protection. Certified to ANSI/BHMA A156.4 Grade 1 standards, it surpasses 25 million cycles in durability tests and comes with a limited 15-year warranty, making it ideal for commercial applications requiring long-lasting performance.