High Load Capacity Design: These U shaped nylon bearing rollers up to 80kg, ensuring smooth sliding for most doors / window without deformation Wide Applications: Suitable for homes (window / balcony doors), warehouses, and mall Solves jamming issues for both residential and commercial users with U grooves compatibility Smooth & Quiet Operations: Premium nylon materials with precisions bearings reduces friction for near quiet movement Perfect for sensitive areas like bedrooms / offices Easy Installation: User friendly design requires not special tools, enabling hand setups even for beginners Simplifies home improvement projects Wear and Resistant: Nylon construction longer lifespans than rollers, excelling in humid / outdoor conditions for stable window / door stability, Manufacturer: ZBIianxer