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).