Heavy-Duty Flat-Bottom Swivel Casters: These wheels rotate 360 degrees, allowing for flexible, smooth, quiet, and precise directional changes. When braking, the mounting plate and wheel lock simultaneously for enhanced stability. Heavy-Duty Design: The flat-bottom brake casters are constructed from high-strength steel. Polyurethane tread offers the resilience of rubber with the durability of metal. This rigid construction provides excellent strength and longevity. Each caster supports up to 40 kg, with a total load capacity of 160 kg per set. Suitable for: Ideal for various indoor and industrial applications including homes, schools, garages, workshops, carts, and medical facilities. Can be used on a wide range of furniture and mobile equipment. The wheels are resistant to stains and corrosion. Compatible with multiple floor types such as carpet, laminate, parquet, wood, cork, tile, granite, paving stones, and lawn. The durable, soft polyurethane exterior glides smoothly, operates quietly, and helps protect floors from scratches and scuffs. Safe and Reliable: Equipped with built-in locking mechanism for easy engagement and release. Double locking feature provides secure support and reliable performance. Quantity: 4 casters. Dimensions: Width 50 mm (refer to image for exact measurements).