This patio door roller is constructed from steel and has a diameter of 1-1/2 in. It comes affixed to an adjustable steel housing assembly. Patio door roller assembly with a 1-1/2 inch concave or grooved steel ball bearing roller. The stamped steel housing is 3/4 inches wide with a 7/8 inch flare, and 1-9/16 inches tall. It is rear adjusting with a threaded mounting hole on the back end. This roller is used on Harcar and similar styled patio doors.