Steel Construction: Sliding Patio Door Roller is crafted from quality steel, these sliding patio door rollers are designed to provide long term durability and reliable performancePrecision Ball Bearing Wheels: Featuring wheel diameter 1-1/2" ,Ball bearing wheel width 3/8", these rollers ensure smooth and effortless sliding for your Pella doorsSize: The roller housing measures 1-7/8" in height, 11/16" in width, and housing width at flange 1-3/16" ,housing length 2-3/4", making it an ideal fit for your door setupEasy Installation: These rollers are designed for straightforward installation, allowing you to quickly replace old or worn out parts without hassleConvenient Two Pack: This package includes 2 roller assemblies, providing you with everything needed to enhance the functionality of your sliding patio doors efficiently Specification: Material: Steel Size Chart: 6.9 cm/2.72 inch Package Includes: 2pcs Sliding Door Wheels Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.