Material: The door stopper is made of sturdy zinc alloy and stainless steel, impact resistant and durable, large bearing surface and symmetrical spring ensure strong closing force. Door Support: Perfect for mechanical doors that require strong closing force, it protects your doors from scratches and stains and prevents handles from damaging your walls. Easy to Use: The door stopper is small and lightweight for easy installation, the concealed screw style ensures quality and durability, even in humid environments. Wide Application: Our metal door stopper is perfect for caravan doorstops, motorhomes, yachts, houses and garden gates.