Safe and Reliable: The hinged silent roller sleeve is precisely mounted on the roller shaft, and its main function is to fill the between the roller and the hinge, providing a good cushioning effect and guaranteeing quiet and smooth operating. Good Adaptability: This product is well adapted to a wide range of garage doors. It is particularly suitable for garage doors up to 80 mm in length, and can effectively meet the needs and standards of this type of garage door. Easy to Install: These sleeves are easily replaceable and the installation procedure is easy to follow. Premium Texture: The garage roller is constructed of premium quality ABS texture, which is safe and has good stability, not easy to be damaged, and can effectively that the garage door is tightly articulated when it is moving to achieve a smooth and steady sliding effect. Noise Reduction: The device is mounted on the roller shaft, and its unique structural design and exquisite craftsmanship can significantly reduce the friction and vibration during operating, and achieve a quiet effect, effectively avoiding the noise interference. Door hinge static roller sleeve combination of its components of the structure is relatively easy, and the connection is more intuitive, the installation workers can be more easily installed to the door and door frame, thus effectively shortening the installation time and improve work efficiency. Static roller rolling in the sleeve, friction is small and rolling track stability, which makes the the opening and closing process can maintain a smooth state of motion, there be no jamming or shaking phenomenon, can effectively reduce the door body on the track and other parts of the impact, to extend the service life. Size:80mm/3.14inch Colour:Silver & Black Material:Metal+Rubber Package Contents: 20 x Sleeve 20 x Roller Shaft Nut Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.