The 7500 Series is a robust, multi-sized surface closer designed to deliver superior performance and long-term reliability. Ideal for interior or exterior doors in facilities that demand reliability, such as government, healthcare and educational institutions. It is the ideal combination of superior performance, strength and quality. Ideal for interior or exterior doors in facilities that demand reliability. The 7500 Series Door Closers exceed 25 million cycles, have a rack and pinion design with a cast aluminum body and are non-handed.