1、Stainless Steel and Copper Material: The sliding door roller assembly is made of premium stainless steel and copper, which is erosion resistance and wear proof, long service life. 2、Superior Workmanship: The ball bearing roller is manufactured to provide the performance and dependability you expect, ensures stable and lasting performance of doors and window. 3、Complete Accessories: The sliding door roller assembly set contains 4 rollers and 8 screws. Strong and practical, improve the efficiency of the doors. 4、Easy to Install: Remove damaged or missing wheel roller assemblies in patio sliding glass doors, then install the new sliding door roller assembly. 5、Multiple Applications: The roller is suitable for most types of sliding doors and window. Improve the safety of your home or office by using reliable fittings. 4 x Sliding Patio Door Roller Assembly8 x Screw Item Type: Sliding Patio Door Roller AssemblyMaterial: Copper, stainless steelWeight: Approx. 137g/ 4.8oz