Features: Material: Made of high-quality metal and nylon, strong and durable Style: Available in 4 styles; select the appropriate specification based on your needs Load capacity: Durable and capable of supporting weight Design: Thicker metal shell for increased hardness and enhanced load-bearing performance 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 / 32g Size: 41mm / 1.61 inches Type: Double Convex Wheel / Double Groove Wheel / Single Convex Wheel / Single Groove Wheel (optional) Note: 1. Please allow 1-2cm variation 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