Prime-Line D 1845 Sliding Door Tandem Roller Assembly, 1-1/4 inch Steel Ball Bearing Product Description This sliding door roller assembly is constructed from steel. It is attached to an adjustable steel housing. This style roller is used by several patio door manufacturers. From the Manufacturer This sliding door roller assembly is constructed from steel. It is attached to an adjustable steel housing. This style roller is used by several patio door manufacturers. Features Used by a variety of sliding patio door manufacturers When the corner screw passes through the F tab the assembly is captured by the side stile and bottom rail as the screw draws the two sides together 1-1/4 in. diameter tandem concave rollers Stamped steel with steel ball bearing Rear adjustment screw Allows the door to roll smoothly 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.