This is a U-tab patio door roller assembly with a 1-1/8 inch concave steel ball bearing roller in a stamped steel "U" back style housing. When installed the U-back housing is drawn tightly into position against the side stile as the mounting screw or bolt is tightened. The housing is 9/16 inch wide with a 3/4 inch flare and 1-1/16 inch tall with a rear adjusting screw. Used by a variety of patio door manufacturers.
This patio door roller is constructed from steel and has a diameter of 1-1/8 in. It comes affixed to an adjustable steel housing assembly. This roller is used by several glass door manufacturers.