WIDELY USED - Our sliding patio door wheels work well for sliding glass doors, screen doors, sliding gates, wood/extruded aluminum/vinyl patio doors, sliding windows, closets, wardrobes, and more. Reach out to us if you have any questions. Were always there for you.PREMIUM MATERIAL - Made of premium alloy steel with exquisite workmanship, the sliding door tandem roller is strong, heavy-duty, anti-rust, and corrosion-resistant, which can withstand loads up to 120kg/265lbs and is uneasy to rust or break even used in a humid environment.EASY TO INSTALL - Quick and simple installation without extra tools. Just remove the damaged or missing tandem roller assemblies from your sliding door and install the new sliding wheels. Your sliding door will function again after the installation!STANDARD SIZE - he sliding door roller measures 1-1/4 inches in wheel diameter and 5/16 inches in wheel thickness (width), a suitable size to fit most sliding doors and widows. The roller will be a good choice for replacing a damaged roller to restore your sliding door to normal use.SET OF 1/2/4 Pcs - You will receive 1/2/4 pcs sliding door tandem roller assemblies. They are of high quality with super smoothness on the bearing, and easy to slide without causing harsh noise. With the rollers, opening a sliding door will not be an effortful thing anymore!