Base material: Steel.Front plate - Steel, Arm - Steel, made out of steel with a chrome finish.Concealed System.Light Duty.Min. door width: 31-1/2".Max. door width: 43-5/16".Door thickness: 43-5/16".Door thickness: 1-3/4".Cycle testing: 200,000 opening cycles.Left / Right Adjustable (Non Handed).Allows the door to be opened at a certain angle (Ajustable) - 120ºHold-open supplied with at any angle 10º - 120º2 speed adjustment valves.O valve controls opening 90 degrees to 15 degrees.Second valve controls closing from 10 degrees to 0 degrees.