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. Adjustable DesignStrength of adjustment increases: adjust clockwise one by one, the default strength of the product is 2 gears, and can only increase 2 gears adjustment force decreases: simply insert the L-shaped key into the long end and press hard to restore the minimum force. Noise Reduction The door closer can reduce interference sound generated when closing 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 Used Our door closers for interior door are suitable for metal doors, fire doors, wooden doors, civil doors and commercial doors, almost all doors under 30 kg. The self-closing adjustable door is an ideal choice for home, office and hotel room doors. Product Description: 1) The wheel of the adjustable self-closing door is made of nylon, which is smoother than traditional plastic, so that the door closes smoothly and quietly. 2) The internal soft-closing of the door closer can close automatically door and closing speed is adjustable to protect your door and lock. 3) The spring door closer adopts universal design, can open the door left and right, suitable for the family, office, hotel room door. 4) Automatic spring clasp will reduce resistance when closing the door to protect the door from damage and reduce the noise. 5) Door closer for interior door is very suitable as a gift for relatives, colleagues, friends, especially for those who often forget to close the door or close the door tightly.