- 1 piece 4 inch TPR double caster universal wheel designed for versatile mobility on carts, trolleys, shelves and equipment. - Screw rod design with a top hole for easy and secure installation, making mounting straightforward. - Flat bottom provides stable contact with surfaces, reducing wobble during movement. - Double wheel configuration increases loadbearing capacity for smoother handling of heavier loads. - Silent operation suitable for homes, offices, workshops, clinics and other settings where minimal noise is important. Key attributes - Function: enables smooth, stable, and quiet rolling of transported items - Compatibility: universal wheel design fits a variety of carts, trolleys, shelves and equipment that use a compatible screw rod mounting with a top hole - Size: 4 inch wheel diameter - Material: TPR (thermoplastic rubber) for quiet rolling and floor-friendly contact - Performance: enhanced loadbearing capacity due to double wheel configuration and stable flat-bottom design Use scenarios - Upgrading moving carts or tool chests in workshops, garages, or warehouses to improve mobility and reduce effort - Replacing worn wheels on furniture carts, display stands, or lab equipment to restore easy, quiet rolling and stability - Rolling equipment or supply carts in offices, classrooms, kitchens, clinics, or studios where low noise and steady movement are important