9024 door closer

1) installation dimension(length*width*height):230mm*19*52 2) suit for door weight 25 100kgs 3)Commercial & residential use, multi-size door closer, adjustableclosing force. 4) Universal application, standard, top jamb, parallel arm installation 5) Closing and latching speed controlled by two separated regulating valves. 6) high quality anti-free hydraulic fluid,normal operating between -30°Cand 40°C 7) Standard adjustable back-check & delay action function. 8) Precision heavy duty rack(piston) & Pinion gear. 9) Factory tested to meet or exceed ANSI standard 156.4 10) Optional full/slim steel cover or PVC cover. 11) finish color optional as request:silver,black,duro,gold etc.