Grade 1 surface applied closers. Complies with ANSI A156.4, Grade 1, 2 million cycles, UL/ULC listed up to 3 hrs fire rated performance. Non-handed. Tri-pack mounting - regular, top jamb and parallel arm applications. Spring power adjustable 1 - 4 and 3 - 6 sizes. Adjustable back check, hydraulic - providing cushioning and preventing uncontrolled openings of the door. Adjustable valves, independent, non-critical (sweep and latch), consistent closing speeds. Metal screws fasteners included for hollow metal and aluminum mounting applications. Wood screws included for wood door mounting applications. Thru-bolts optional. Door range up to 180 deg. Door Preparation: 9-1/16 in horizontal and 3/4 in vertical mounting hole locations (retrofits traditional closer).