Scratch and Rust Protection to Reduce Noise - The door bottom guide features a practical galvanized cast iron seat and rubber pulley. The silver-colored surface provides scratch and rust protection, ensuring long-lasting use indoors or outdoors. The rubber pulley is durable and rolls quietly and smoothly, reducing noise. Adjustable Automatic Door Accessories - The rubber pulleys are adjustable to ensure a perfect fit. It can be installed on automatic doors with a thickness of 30 mm to 60 mm. No matter what size or type of automatic door you have, it is applicable. We guarantee that this automatic door accessory provides a firm fit and can hold it well. Provides More Intimate Protection - A 2.9 cm long top is installed on the left side of the door bottom guide plate, which can protect the door well and prevent the door from being damaged during movement. The specially designed sliding door kit, flat design and rounded edges can protect toes and knees from injury. Easy to Install - The installation of automatic door accessories is very simple, just adjust the pulley to the door's position, and then tighten the screw at the bottom of the floor guide to fix the roller in the available position. The door does not need any tracks and the installation does not take much time. Simple and Practical Design - The guide wheel is intended for automatic doors, sliding doors, frame doors, wooden doors and metal doors. The silver-colored design fits most interior styles, which is both beautiful and practical and can match your door well. Meets all your needs, excellent quality will not disappoint you.