To ensure the performance and longevity of your sliding , it is crucial to properly attach the pulley to the track. Begin by carefully aligning the pulley with the track to ensure smooth and efficient operation. This will help in reducing friction and wear, thereby extending the life of your sliding door mechanism. Additionally, double-check that the pulley is vertically oriented and that it moves freely along the track without any obstructions. Proper alignment and secure attachment are achieving optimal functionality and ease of use. Features -Color:Multi -Material:PP, nylon -Size:6.90X2.30X2.30cm/2.71X0.90X0.90in -Mounting hole spacing: 30 mm -Smooth sliding action: the door sliding rollers ensure the door slides smoothly and effortlessly, enhancing user convenience -Wear resistant track: on the track provides deform resistance and durability, making it suitable for long term use -Easy vertical installation: designed for vertical directional sliding doors, this product is easy to install and operate, offering a userfriendly experience - and robust: this sliding door track and roller are built to withstand regular use and provide performance -Stable single roller: the single wheel roller design ensures stability and extends the product's lifespan, making it a reliable choice for sliding doors Package list: 4 x sliding pulleys