Package includes: 2 sliding door wheels and 2 mounting hardware. High-quality material: Made of high-hardness ferroalloy, thick material, not easily deformed, sturdy, durable, wear-resistant, and corrosion-resistant. Roller design: Ensures better adjustment and smoother sliding, stable and safe to use. With this accessory, you can open the closet door more conveniently and easily. Quiet operation: With the damping buffer, they run quietly and robustly, protecting you from loud noises and possible injuries caused by the door suddenly slamming. Versatile use: Fits sliding doors of wardrobes, windows, closets, display cabinets and shoe cabinets, closet doors, etc. And is an ideal replacement for your conventional casters.