This Sliding Glass Patio Door Roller has a 1-1/2 inch (38.1 millimeter) diameter steel ball bearing roller which is 5/16 inch (7.9 millimeter) wide. The steel housing is 3/4 inch (19.1 millimeter) wide and 1-3/8 inch (34.9 millimeter) tall. This patio door roller is used by several sliding glass door manufacturers.