1. material: this mechanical door stop is made of zinc alloy, which has high strength and corrosion resistance for durability, and its sturdy construction ensures that even heavy doors can be handled with ease. 2.Product contents: buy our product, you will receive a complete set of door stopper base, including the body made of zinc alloy, attached strong adhesive paper and screws to meet different installation requirements and floor conditions. 3.Multifunctional design: the door holder is made of soft, shockabsorbing material to ensure quiet operation, ideal for protecting walls, doors and floors from damage, the first pressure locks the door, and another pressure unlocks it, providing a comfortable user experience. 4.Two installation methods: you can choose the installation method according to your preference or floor condition, selfadhesive or perforated installation, install the door stop according to the instructions, the telescopic rod of the door lock is adjustable to adapt to different thicknesses of doors and floors, the range of the door gap is from 5 to 20 mm.