Prime-Line D 1523 Sliding Door Roller Assembly with 1-1/8 inch Steel Ball Bearing Product Description This patio door roller is constructed from steel. It comes affixed to an adjustable steel housing assembly. Used by several glass door manufacturers. From the Manufacturer This patio door roller is constructed from steel. It comes affixed to an adjustable steel housing assembly. Used by several glass door manufacturers. Features Used by a variety of door manufacturers The K-tab has a T-shape that slides into an opposite T-shape in the patio door frame 1-1/8 in. diameter concave ball bearing roller Stamped steel housing and roller Used on metal framed sliding patio doors Easy to install 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.