Stanley 829531 Door Closer, Aluminum, Grade 1For high frequency rapid door swing applications. Spring power size range is adjustable from 2 through 6. With more than 50 percent adjustment over size 6. The rating at size 2 is the same and at size 6 this closer is rated for 14 pounds minimum closing force on a 180 pound door. Controls the door through the entire opening closing cycles. Back check, gen and latch speeds are equipped with non critical "v slot" regulating valves, which allows for fine