Metal MaterialSliding Patio Door Rollers are made of stainless steel frame and copper wheel, rust resistant and sturdy structureFeatureThis tandem roller assembly with quality ball wheel bearing ensure smooth and quiet movement every time you slide your doorsNoise ReductionThe rollers' smooth operation helps minimize annoying squeaks and rattles from sliding doorsEasy InstallationNo complicated tools required, suitable for replacing damaged or missing roller components on your doors or windowsApplicationSuitable for a variety of door types and thicknesses, these rollers can be used on a wide range of sliding door systems, great for barn door, closet door, or any other sliding application Size Chart: 5.9cmx3.4cmx3.7cm/2.32inchx1.34inchx1.46inch Package Includes: 2 Sliding Patio Door Rollers Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.