The housing and integrated mounting plates of the heavy-duty minis are made of galvanized industrial steel, while the hub is constructed from solid cast iron. The tread of the wheels is coated with abrasion-resistant and high-temperature-resistant polyurethane (PUR). High-quality materials and craftsmanship, along with sophisticated technical details, allow these extremely durable wheels to easily transport heavy loads, withstand continuous use in workshops, or facilitate the gentle and floor-friendly movement of heavy furniture pieces. Particularly noteworthy: the wheel axles of the heavy-duty minis are not conventionally riveted but bolted; this allows for quick tightening of the bolts. A ball ring in the mounting plate and double ball bearings ensure excellent maneuverability, quiet movement, and optimal rolling. The installation is quick and easy: just screw it on and roll away!.