This sliding pulley is engineered to improve the functionality of old-style sliding windows and doors. The combination of stainless steel and copper wheels ensures durability and smooth operation. Its user-friendly design simplifies installation, while its reliable performance meets the demands of modern households and professional settings Features -Color:Silver -Material:Stainless steel, brass -Size:7.80X4.00X1.35cm/3.07X1.57X0.53in -Size:2.70X0.70X0.70cm/1.06X0.28X0.28in - stainless steel: constructed from sturdy stainless steel, these pulleys are built to withstand frequent use, making them suitable for both residential and commercial applications. -Smooth copper wheel design: the dual copper wheels ensure smooth and quiet operation, enhancing the comfort of your living space and making them ideal for upgrading old sliding windows. -Versatile installation: these pulleys are compatible with various track types, allowing for easy installation on glass sliding doors and improving door stability and user experience. -practical load support: with a high loadbearing capacity, these pulleys ensure the smooth movement of heavy window or door panels, addressing the issue of traditional pulleys' insufficient load capacity. -Excellent durability and weather resistance: these pulleys offer fine wear and weather resistance, maintaining stable performance in different climates and reducing the need for frequent maintenance. Package list: 2 and window pulley