Prime-Line D 1986 Sliding Door Tandem Roller Assembly with 1-1/4 inch Steel Ball Bearing Product Description This sliding door tandem roller assembly is constructed from steel. It features a ball bearing roller and comes attached to an adjustable steel housing. This style roller is used by several patio door manufacturers. From the Manufacturer This sliding door tandem roller assembly is constructed from steel. It features a ball bearing roller and comes attached to an adjustable steel housing. This style roller is used by several patio door manufacturers. Features Used by a variety of metal and vinyl framed sliding patio door manufacturers 1/4-20 Threaded mounting hole on the back end and an optional use #10-32 threaded hole on the top of the housing 1-1/4 in. tandem concave ball bearing rollers Stamped steel housing and rollers Plain back Rear adjusting screw 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.