Sliding door runner wheels come in various designs to accommodate different door types and weights. Some of the common types include

It thus implies that you can use same extrusion for top and bottom.
Conclusion

For starters, things can serve a practical purpose in our lives. From the moment we wake up in the morning, we interact with a multitude of things that help us navigate through our day. We use utensils to eat our breakfast, a toothbrush to clean our teeth, and a car to commute to work. Without these things, our daily routines would be much more difficult and inefficient.
At first glance, the question seems simple Are there more doors or wheels? To begin to analyze this, we must first define what constitutes a door and what qualifies as a wheel. Doors can be found in homes, offices, vehicles, and public buildings. They serve as entrances, exits, and barriers for safety and privacy. A simple calculation of the number of doors in a typical house, for instance, can reveal that a modest home might have anywhere from a few to a dozen doors, including interior doors, exterior doors, and cupboard doors.
Our decorative cast iron ball post caps are available in the following styles: