These are longer than most similar rollers I have seen.
2" long where most others max out at around 1-1/2".
Sorry for the fuzzy one. The rail they sit on looks almost flat, but these wheels seem slightly concave. They have multiple flat spots on them. Metal wheels or at least plastic with ball bearings would last a lot better. If you can get just the wheels, they would be easy to snap in the old housing. Thanks, Owen, The Patio Door Guy.
