Material The automatic spring closer is made of cold rolled steel and zinc alloy. The use of one-piece casting process and electroplating process makes the whole product rust free and long lasting of life. Package Contents After purchase, you will get a door closer, 4 screws, an adjustment rod and a gasket for the protective door. The stainless steel spring door closer no need to buy other parts. Adjustable Design Our internal automatic door closer adopts adjustable design. You can use the included adjustment rod to insert the rotating hole and adjust the closing force as needed to increase the convenience of closing from the door. Noise Reduction The door closer can reduce the sound interference generated when closing the door, close the door slowly to reduce the damage to the door from impact, and can prevent you from forgetting to close the door. Widely Used Our interior door closers are compatible with metal doors, fire doors, wood doors, civil doors and commercial doors, almost any door under 10kg. The adjustable door with automatic closing is an ideal choice for home, office and hotel room doors. The adjustable self-closing door wheel is made of nylon, smoother than traditional plastic, so the door closes smoothly and silently. The internal closing of the door closer can automatically close the door and the closing speed is adjustable to protect your door and lock. Spring door closer adopts universal design, can open the door left and right, compatible with family, office, hotel room door. The automatic door closer will reduce the force when closing the door to protect the door from damage and reduce noise. The interior door closer is very compatible with a gift for parents, coworkers, friends, especially those who often forget to close the door or close the door. Product specifications: Material: Steel, Zinc alloy, Nylon Color: Black Size: 160 * 126 * 34.3 / 6.3 * 4.96 * 1.35 inch Package contents: 1 * Door closer 1 * Adjustment rod 4 * Screws 1 * Gasket