Godrej C071 Aluminum Alloy Door Closer Constructed with extruded anodized aluminum body & high quality steel internal components.Compact design with minimized projection allowing installation to door having adjacent return wall at 90°.Heat treated steel rack & pinion immersed in high grade oil to give a smooth precise action & minimum wear.Stable hydraulic fluid for any climatic operation & constant lubrication.Heat treated high tensile springs.Piston & spindle been heat treated for high strength. Adjustable Closing & Latching Speed (in 2S model) 1=Closing Speed Adjusting Valve, range 120° ~ 15° 2=Latching Speed Adjusting Valve, range 15°~ 0°