This is a pulley, which is safe, durable, convenient and practical. It is mainly suitable for reversing railings, yard gates, rolling doors, sliding doors, rail doors, etc. It has good flexibility, can be easily slid, and is easy to install and use. Can bring you great convenience. Excellent craftsmanship and reasonable design make it durable and practical. It is a very efficient and practical pulley.Features- Color: Light yellow.- Material: Nylon.- Size: 11.00X5.00X5.00cm;/4.32X1.97X1.97in;- The efficient and practical pulley has the characteristics of sturdiness and durability and a .- With a simple application method, you can easily install and remove it.- The product has good craft details and a smooth and comfortable touch, which can serve you well.- The carefully crafted pulley has , good toughness, wear resistance, and a stable structure.- Adopts precision production to stable characteristics and high reliability.Package list: 4 x Guiding Wheels