Slide-Co 13177 Sliding Glass Door Roller Assembly 1-1/4” has a nylon ball bearing roller with adjustable steel housing. Replace old style extruded aluminum assemblies. Dimensions: 5/8" Thick, 2-1/8" Long, 1-13/16" High, 3/4" Overall Thickness.*1-1/4" Nylon Ball Bearing Roller*Adjustable Steel Housing*Sliding Glass Door Roller Assembly*Replace Old Style Extruded Aluminum Assembly*Nylon ball bearing roller;For sliding glass doors;Adjustable steel housing