Product Description Slide-Co 131449 Sliding Glass Door Roller Assembly 1-1/4” steel ball bearing roller unit. Adjustable steel housing. Housing dimensions: thickness 9/16", length 2" and height 1-3/16", overall 13/16". From the Manufacturer Slide-Co 131449 Sliding Glass Door Roller Assembly 1-1/4” steel ball bearing roller unit. Adjustable steel housing. Housing dimensions: thickness 9/16", length 2" & height 1-3/16", overall 13/16"