Extra Heavy Duty Institutional Parallel Arm Adjustable Left Hand Smoothee Door Closer - LCN 4111 Best performing extra heavy duty closer specifically designed for potentially abusive applications because of its high durability standards with forged steel main arm that attributes to the durability of the closer under rugged use and super high traffic areas Used for LEFT HAND (See Image) interior doors up to 4 feet 6 inches wide (exterior doors to 3 feet 6 inches wide), cast iron cylinder adjustable from size 1 through 5 (ships set to 3), mounts hinge size (pull side) LCN 4111 Smoothee is tested and proven to endure ten million cycles and closes without getting damaged due to the all weather fluid that allows it to be used in all weather conditions. Certified and tested under ANSI Standard A156.4, Grade 1, UL and cUL listed for self-closing doors without hold-open. ADA requirements met. Easy installation with all commercial door hardware including a peel and stick mounting template and detailed instructions.