Complete Accessories: The sliding door roller set contains 4 rollers and 8 screws. Strong and practical, it improves door efficiency. Stainless Steel and Copper Material: The sliding door roller set is made of premium stainless steel and copper, which is resistant to erosion and wear, ensuring a 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 accessories. Superior Workmanship: The ball-bearing roller is manufactured to provide the performance and reliability you expect, ensuring stable and long-lasting performance of doors and windows. Easy to Install: Remove the roller assemblies from the damaged or missing wheels on the sliding glass patio doors, then install the new sliding door roller set.