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Construction & Technical Details(1) Constructed with precise aluminum die-cast body with rustproof steel arm(2) Heat treated steel rack and pinion immersed in high grade oil operate a nest of coils to give a smooth precise action & minimum wear(3) Piston and spindle has been heat treated for high strength(4) Stable hydraulic oil for any climatic operation and constant lubrication from -45°C to +50°CFunction(1) Available for 6 different power sizes can be used on interior or exterior door(2) Adjustable closing & latching speeda.Closing speed adjusting valve, range from 180° to 15°b.Latching speed adjusting valve, range from 15° to 0°(3) Built-in hold open (optional)a. Built-in hold open function can be used to hold door open at angle 85° round(4) Adjustable backcheck (optional)a. Backcheck function provides a cushioning effect when the door is forcibly thrown open but does not serve as a substitute for a door stop. Normal operation range from 75&d