Features: Material: Made of high-quality metal and nylon, strong and durable Style: Available in 4 styles; choose the appropriate specification based on your needs Load capacity: Durable and capable of bearing weight Design: Thicker metal shell with higher hardness and enhanced load-bearing strength Application: Suitable for track reversal, rolling gates, sliding doors, industrial machinery, wire rope guide rails, container racks, baby gates, pet doors, and more Package Includes: 1 x Sliding Door Roller Kit Specifications: Material: Metal Weight: 42g or 32g Size: 41mm (1.61 inches) Type: Double Convex Wheel, Double Groove Wheel, Single Convex Wheel, or Single Groove Wheel (optional) Note: 1. Please allow 1-2cm measurement deviation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the actual color of the item may vary from the image.