This is an S-tab patio door roller assembly with a 1-1/4 inch concave or grooved steel ball bearing roller. When the corner screw passes through the S-tab it is captured by the side stile and bottom rail as the screw draws the two sides together. The housing is 17/32 inch wide and 1-5/32 inch tall. It is a common shape that a variety of patio door designers have incorporated into their patio door.
This sliding door roller assembly is constructed from steel. It features a ball bearing roller and comes attached to an adjustable steel housing. This style roller is used by several patio door manufacturers.