Roller only, no housing. Many early patio door bottom rails were 7/8" inside dimension. The new roller is inserted into the bottom rail, star axle is driven into the axle hole, through the roller and into the rivet on the opposite side. Rotating the star axle will raise or lower the roller/door. Once the correct position is aquired, a set screw is then put into place. Part# 13294
Number. 5000564