The U shaped pulley assembly is easy to install and requires minimal maintenance. Its precision engineering reliable performance. for sliding , this roller ensures smooth and quiet operation, making it an ideal choice for homes, offices, and other spaces where noise reduction is important. Features -Color:Silver -Material:Iron ,S45C steel -Size:8.00X4.50X3.40cm/3.14X1.77X1.34in -Precision engineering: cnc precision forging results in a smooth surface, offering uniform force distribution and a visually appealing design -Sturdy construction: made from iron and s45c steel, these rollers are designed for durability and performance in various applications -Multipurpose use: compatible with 15/8 inch wide and 15/8 inch or higher channel posts, for sliding doors in warehouses, garages, and more -Effortless movement: these rollers ensure smooth and quiet rolling with minimal resistance, enhancing the ease of use -Exceptional load capacity: capable of supporting up to 1256 kg, these rollers are ideal for heavy duty sliding doors, providing reliable and robust list: 1 x U-shaped pulley assembly