Finishes: May include paint, anodizing, or powder coating that provides corrosion resistance and an aesthetically pleasing appearance.
It is quite popular and can be used with self-tapping screws or merely threaded to take a machine screw.
Wrought Iron Fencing
2. Metal Wheels Made from materials like steel or aluminum, metal wheels are designed for heavier doors. They provide durability and better load-bearing capabilities, making them ideal for external sliding doors.