Sufficient quantity for daily need: you will get 2 pieces of sliding glass window rollers, enough quantity for using in different doors at one time, also you can replace the broken one in time or share one with others to show your kindnessAppropriate size for effortless use: each sliding door tandem roller measures about 5/16-inch in wheel thickness (width) and 1-1/4-inch in diameter, a suitable size for replacing damaged or missing roller assemblies on sliding doors or windowsQuality material for long time application: sliding door roller wheel uses quality brass to make, stable and not easy to break, safe and reliable, allowing you to use it with confidence for a long period; Also the radial ball bearings will still work after many cycles because of the heat treated bearing steelSimple to install: the sliding door roller assembly can be installed fast and effortlessly without extra tools, just remove the broken or missing tandem roller assemblies from your sliding glass doors or windows, then install our glass patio door rollers, and your sliding glass door will function well againWide range of applications: sliding patio door wheel works well for sliding glass door, screen door, sliding gate, window, vinyl patio doors, closet and more, versatile and practical Product Description