Yellow Zinc Patio Door Roller Assembly 1 1 2 Inch Steel Ball Bearing Easy Ins...
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. 1/4-20 threaded mounting hole on the back end and an optional use 10-32 threaded hole on the top of the housing.