Widely suitable for reversing railings, yard gates, sliding doors, rail doors, etc. Easy to install and use. Can bring you great convenience. Sturdy nylon materials, wear resistant. Stable and sturdy bolt allows durable fixation and not easy to loosen. Features - Color: Yellow -Material:Nylon - Size: 8.60X4.80X4.80cm/3.38X1.89X1.89in - It is made of good nylon material, strong and durable, and can serve you for a longtime. - Reasonable design can help reduce vibration and make it more practical. - Excellent craftsmanship makes it have good flexibility, easy to slide, and use more smoothly. - You can apply it to sliding doors, rail doors and other furniture to easily replace old accessories. - Convenient and practical will be your excellent replacement parts, which will well meet your needs.Package list: 4 x Guiding Wheels