Widely suitable for reversing railings, yard gates, sliding doors, and rail doors. Easy to install and use. Provides convenient functionality. Made of sturdy nylon material, wear-resistant. Stable and sturdy bolt ensures durable fixation and resists loosening. Features - Color: Black - Material: Nylon - Size: 6.50 x 3.00 x 3.00 cm / 2.55 x 1.18 x 1.18 in - Fine Workmanship: Made of high-quality nylon material, strong and durable for long-term use - Compact and Portable: Thoughtful design helps reduce vibration for improved performance - Practical and Versatile: Well-crafted for good flexibility, allowing smooth sliding operation - Creative Design: Suitable for use on sliding doors, rail doors, and other furniture applications as a replacement for old components - Easy and Long-Lasting: Convenient and reliable, serves as a practical replacement part to meet everyday needs Package list: 4 x Guiding Wheels