The engineered pulley structure glides, reducing noise and enhancing the overall user Craft from stainless steel, these rollers sturdy and portable to use, ensuring long time use For use in residential setting such as balconies door and Window, as well as commercial space like sliding door, providing functionality For enthusiasts and home improvement professional look to upgrades or maintain sliding door systems with sturdy components Enhances your sliding door and Window with our 2pcs Stainless Steel Double Wheel Bearing Rollers, designs for smooth and quiet operations, Manufacturer: Kaeltsyn