This is an unique back adjustable diecast patio door roller assembly with a 1-1/4 inch concave steel ball bearing roller used by a variety of patio door manufacturers. It's diecast housing is a cross between the unique or the plain back styles. It is 11/16 inch wide, 1-1/8 inch tall and 2-11/16 inch long with a diecast mounting tab on top. There is a 1/4-20 threaded mounting hole in the back end and a mounting tab on the top.
This patio door roller is constructed from steel and has a diameter of 1-1/4 in. It comes affixed to an adjustable die cast housing assembly. This roller is used by several patio door manufacturers.