Material: : The door stopper is made of zinc alloy material, strong, inclusive large contact surface, shock-resistant, symmetrical spring, thus locking force. . Application: : The door retainer is suitable for the use of mechanical equipment that requires a large locking force as a lock ball. Protects your doors from marks, scratches, your walls from scratches of the handles. . Easy to use: : Disengaged by gently pulling door away from the door stop and avoid the door being suddenly closed. It works like a door bumper to prevent the door from slamming from the wind. . Easy to install: : The door retainer is small in size and light in weight, concealed screw style ensuring quality and longevity in wet environments, no worry rip off like other rubber door stopper. . Tips: : Our pictures are physical map, all the products are actually received prevail. Thank you very much for your purchase and wish you a happy life . Door Stopper for Caravan Motorhomes and Boat Door Clip Zinc Alloy Stainless Steel .