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, protect your doors from scratches and stains and prevent handles from damaging your walls. Easy to Use: The door stopper is small and lightweight for easy installation, concealed screw style ensures quality and durability even in humid environments. Wide Application: Our metal door stopper is perfect for caravan door block, motorhomes, yachts, houses and garden gates. Note: The data are all manually measured, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.