This Andersen roller assembly is an insert style with mounting tabs and include installation screws. The high density polyethylene housing has an aluminum inner housing with a 1 in. high density polyethylene roller. This roller assembly is used on the 200 Series Perma-Shield Gliding Doors and 400 Series Frenchwood doors. Height adjustment is down from the side rather than the top or the edge of the door. Brand Name: Prime-Line Diameter: 1 in. Length: 1/4 in.