The overall dimension of the wheel (diameter x width) is 150mm x 25mm, the internal diameter of the center bearing is 8mm, and the length of the axle bolts is 84mm. Please check the detailed dimensions on the product image before purchasing. The package includes 2 gray front spare wheels and 2 axles, designed for easy and convenient installation without complicated steps, saving time and effort. Made of high-quality, eco-friendly rubber, this solid replacement wheel set is anti-slip, dust-proof, and offers strong wear resistance and load-bearing capacity. Suitable for a wide range of applications including wheelchairs, rollators, walkers, and other mobility devices with 6-inch wheels. This front wheel replacement set provides a quiet, smooth, and light ride on all surfaces, ideal for both indoor and outdoor use. Durable, practical, and labor-saving. Product Description: This 6-inch rubber replacement wheel set is compatible with most wheelchairs, walkers, and mobility aids. Designed for easy self-installation. Specifications: Material: Solid Rubber Color: Gray Wheel dimensions (diameter x width): 150mm x 25mm Internal diameter of central bearing: 8mm Distance between bearings on both sides: 50mm Axle bolt length: 84mm Total weight: 700g Package Includes: 2 gray 6-inch front spare wheels 2 axle bolts