Falcon SC71-Aluminum Heavy Duty Closer. UL approved and compliant with the UL 10C and UBC 7-2 (1997) fire test. Additionally, the SC71 is rated ANSI/BHMA A156.4, grade 1 and designed to meet the American Disabilities Act (ADA) and ANSI A117.1. 1-1?2″ diameter piston. Adjustable sizes 1-6. Single piece cast aluminum body. Staked valves. Non-handed for left or right swinging doors. Fast and easy installation. Separate adjustable general speed, latch speed and backcheck. Heat-treated forged steel piston. Double heat-treated pinion. Universal screw pack for aluminum, hollow metal and wood doors.