Product Description Slide-Co 132603 Adjustable Sliding Patio Door Tandem Roller Assembly 1-1/8” Steel, 1-5/16” minimum collapsed height. Tandem steel ball bearing rollers. Adjustable steel housing assembly. From the Manufacturer Slide-Co 132603 Adjustable Sliding Patio Door Tandem Roller Assembly 1-1/8” Steel, 1-5/16” minimum collapsed height. Tandem steel ball bearing rollers. Adjustable steel housing assembly.