Stainless Steel and Copper Material: The sliding door roller assembly is made of premium stainless steel and copper, which is resistant to erosion and wear, long service life. Multiple Applications: The roller is suitable for most types of sliding doors and windows. Improve the security of your home or office by using reliable fittings. Superior Workmanship: The ball bearing roller is manufactured to provide the performance and reliability you expect, ensuring stable performance and doors and windows. Complete Accessories: The sliding door roller mounting kit contains 4 rollers and 8 screws. Solid and practical, improve door efficiency. Easy to Install: Remove damaged or missing wheel roller assemblies in patio glass sliding doors, then install the new sliding door roller assembly.