Plain back patio door roller assembly with a 1-1/2 in. Concave or grooved steel ball bearing roller. It's back is 11/16 in. Wide with a 7/8 in. Flare, and 1-9/16 in. Tall. It is rear adjusting with a 1/4-20 threaded mounting hole on the back end. It is used by a variety of manufacturers of patio doors. Part# 131242
Number. 5001242