Prime-Line D 1686 Adjustable Concave Edge Sliding Door Assortment, 1-1/4 in Dia X 5/16 in W, 1 Roller, quot 1-1/4in. Steel ball bearing roller unit Used by several glass door manufacturers Housing dimensions: W: 9/16in. L: 1-5/16in. H: 1-1/8in. Overall thickness: 21/32in. Adjustable steel housing assembly