The Norton 1601H689 is a medium-duty, surface-mounted door closer featuring an adjustable hold-open function and aluminum finish with sex nuts for secure installation. Engineered by Norton Door Controls, it incorporates a refined rack and pinion design and valve-controlled backcheck for reliable hydraulic operation. This non-handed model includes adjustable backcheck and speed controls, molded plastic cover, and corrosion-resistant aluminum alloy construction. Certified to ANSI/BHMA A156.4 Grade 1 standards, it delivers durability beyond 25 million cycles and comes with a limited 15-year warranty for commercial applications.