Prime-Line D 1563 1-1/2 In. Steel Roller Assembly with Ball Bearing and Plain Back Housing, for Air Control, Howmet, Krestmark (Single Pack), Yellow zinc

This is a plain back patio door roller assembly with a 1-1/2 inch concave or grooved steel ball bearing roller. It has a plain back housing that is 3/4 inch wide and 1-3/8 inch tall. It is rear adjusting with a 1/4-20 threaded mounting hole on the back end and an optional use #10-32 threaded hole on top. It is used by Air Control, Howmet, Krestmark and a variety of other manufacturers of patio doors.