Marks USA's Survivor Series locksets.
Photo credit: (Photo courtesy Marks USA)
Marks USA Grade 1 195/175 Survivor Series locksets are the most durable cylindrical lever locksets. The series is offered in four lever styles, conventional cylinder, IC core for “Best” size cores and Schlage as well as others. The Survivor Series locksets are backed by Marks lifetime mechanical warranty and tests to 3,000,000 + cycles. All functions are available in six standard finishes, are UL Listed for 3-hour fire rating, and satisfy ADA requirements.