Slide-Co 13808-S Sliding Patio Door Roller Assembly, 1-1/4 inch Wheel Diameter, Product Description This sliding glass door roller assembly is constructed from steel and features a height-adjustable housing. The housing measures 11/16 inches thick and has 2 mounting tabs with the center of the holes spread at 5-3/4 inches from center to center. This roller assembly has a minimum collapsed height of 1-1/2 inches. The concaved (or grooved) edge wheels installed in this roller assembly are also constructed of steel and include steel ball bearings for smooth and long-lasting operation. The wheels are situated in tandem style and are designed to glide on a single raised aluminum or steel track. This item includes only one tandem roller assembly per package, but a total of 2 roller assemblies are required for each sliding door. These roller assemblies are used to repair patio sliding doors with missing, damaged or malfunctioning roller assemblies. Installation fasteners are not included with this item. From the Manufacturer Slide-Co 13808-S Sliding Glass Door Roller Assembly 1-1/4? steel ball bearing roller. Tandem design. Adjustable steel housing. Housing dimensions: thickness 3/4", length 6-1/4", height 1-3/16". Features Used for replacing damaged or missing roller assemblies on sliding patio doors 1-1/4 in. outside wheel diameter x 11/16 in. thick housing x 5-3/4 in. hole centers. This roller assembly has a minimum collapsed height of 1-1/2 in. This roller assembly features 2 tandem style wheels with concaved (grooved) edges Steel housing construction with steel ball bearing wheels For further dimensional information, please see the line drawing USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.