Premium Quality Furniture Casters with Galvanization: Our heavy-duty casters are equipped with a sturdy galvanized iron shell that provides optimal protection against rust thanks to the passivation treatment. The one-piece cast iron design with a thick, oxidation-resistant surface makes these furniture casters particularly durable for continuous use on sliding doors and furniture. Premium Quality Sliding Door Casters with Double Wheels Safety: The dual-spring design of our sliding door rollers combines anti-slip protection and height adjustment. The built-in safety feature keeps the sliding door rollers stable in the track, while the adjustable screws allow for precise adjustment, ideal for heavy-duty applications. Ultra-quiet furniture casters: Sliding door casters are made of premium nylon for quiet operation. The special geometry and polished surface of our furniture casters ensure low-vibration operation, perfect for bedrooms and living spaces where rest is crucial. Universal