Quality MaterialThis Heavy Duty Automatic Door Closer Is Made Of Quality Solid Aluminum Alloy Material, Commercial Grade And Fireproof, High Strength And Hardness, Anti-Rust Oxidation And Of Heat, Not Easy To Bend Deformation Or Damaged, Durable Enough To Serve A Long And Stable Life Brilliant PerformanceThis Fire Rated Overhead Door Closer Has Been Tested For Over 1,000,000 Cycles Opening And Closing, Super Flexible Rotation And Not Easy To Get Stuck, Extra Stable Structure Enables It To Bear Weight Up To 65Kg, And It Is Suitable For Door Width 600-1200Mm, Ideal For Single Door Or Double, Wooden Door Or Glass Door Fully Adjustable SpeedThe Two Valves Of This Hydraulic Buffer Original Positioning Spring Closing Device Are Independent, You Can Control Both The Movement Speed Of The Hydraulic Buffer. Oscillation And Closing Speed Of The Latch T. Self-Tune The Mechanism According To Your Needs. Choose Your Return Speed According To The Environment The Nearest One Is Placed In So That It Won'T Damage The Door Or Hurt People Easy Installation Wide ApplicationIt'S Also Quite Easy To Install This Universal Door Closer, We Will Send You All The Accessories You Need To Install The Door Closer And It Can Be Widely Used In Home Or Commercial Service, Suitable For Wooden Door, Glass Door, Sectional Door -Fire Or Metal Door