... speed, Delay action,power adjustable Door closer,overhead door closer, door hardwar 1.All of "UNILOCKS" Door closer body must be treaed ... excellent performance.902-4-CW: door weight 25-85kgs, size: 230X19mm903-6-CW: door weight 60-120kgs. size: 280X19mmBack Check start about ... (DA)Reduced Spring Power for Barrier Free (BF)Door closer,overhead door closer, door hardwareUL Listed Fire Tested Heavy Duty ...