Features: 100% brand new and high quality Material: Made of high-quality metal + nylon, strong and durable. Style: There are 6 styles for you to choose, choose the corresponding specifications according to your needs. Load capacity: durable and load-bearing. Features: Heavy-duty and sturdy guide bearings bring huge load to your project, adopt V-shaped bracket design, run more smoothly. Application: Used for rail reversal, rolling gate, sliding door, industrial machinery, wire rope guide rail device, container rack, baby door, dog door, etc. Package Includes: 4x Groove Wheels Specifications: Material: Metal+Nylon Size: 6x1.9cm/2.36x0.75inch Wheel Type: Nylon Wheel/Copper Wheel Style: Color Nickel Shell/Stainless Steel/Bearing Type 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.