Features: 100% brand new and high quality Material: Made of high-quality metal + nylon, strong and durable. Style: There are 4 styles for you to choose from, choose the corresponding specifications according to your needs. Carrying capacity: durable and load-bearing. Features: Thicker metal iron shell, higher hardness and stronger load-bearing capacity. Application: used for track reversal, rolling gate, sliding door, industrial machinery, wire rope guide rail device, container rack, baby door, dog door, etc. Package Includes: 1x Sliding Door Roller Kit Specifications: Material: Metal Weight: 42g/32g Size: 41mm/1.61inch Type: Double Convex Wheel/Double Groove Wheel/Single Convex Wheel/Single Groove Wheel(optional) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.