Door Closers, Automatic Spring Closer, Steel Adjustable Door Closer, Internal Automatic Door Closer, With Allen Key And Screws, For Automatic Door Clo Excellent MaterialThe Automatic Spring Clasp Is Made Of Stainless Steel And Zinc Alloy. It Adopts One-Piece Molding Process And Multi-Channel Assembly Process To Make The Whole Product Durable, Rustless And Long Service Life.Package Contents After Purchasing, You Will Get A Door Closer, 4 Screws, An Allen Key And A Seal For The Protective Door. The Stainless Steel Spring Door Closer Is Easy To Install, No Need To Buy Other Parts.Adjustable DesignAdjustment Force Increases: Adjust Clockwise One By One , The Default Strength Of The Product Is 2 Gears, And Can Only Increase By 2 Gears; The Adjustment Force Decreases: Simply Insert The L-Shaped Key Into The Long End And Press Hard To Restore The Minimum Force.Noise ReductionThe Door Closer Can Reduce The Noise Interference Generated When Closing Of The Door, Close The Door Slowly To Reduce The Damage To The Door Caused By Strong Impact And Prevent You From Forgetting To Close The Door.Widely UsedOur Door Closers For Interior Door Are Suitable For Metal Doors, To Fire Doors, Wooden Doors, Civil Doors And Commercial Doors, Almost All Doors Under 30 Kg. Self-Closing Adjustable Door Is An Ideal Choice For Home, Office And Hotel Room Doors.