The overall dimension of the wheel (diameter x width) is 150mm x 24mm / 5.9 x 0.94, the inner diameter of the center bearing is 8mm / 0.3, and the length of the axle screws is 75mm / 2.95. Please check the detailed dimensions in the product images before purchasing. Package includes 2x gray front spare wheels and 2x axles, easy and convenient to install without complicated steps. Made of high-quality, environmentally friendly rubber material, this solid replacement wheel set is anti-slip, dustproof, and offers strong wear resistance and load-bearing capacity. Suitable for a wide range of applications including mobility devices and healthcare equipment, compatible with most wheelchairs, walkers, rollators, and other replacement accessories with 6-inch wheels. This front wheel replacement set provides a quiet, smooth, and lightweight ride on all surfaces, ideal for both indoor and outdoor use. Economical, practical, and built for long-term durability. Specification: Material: Solid Rubber Color: Gray Overall Wheel Dimension (Diameter x Width): 150mm x 24mm / 5.9 x 0.94 Center Bearing Inner Diameter: 8mm / 0.3 Distance Between Bearings on Both Sides: 40mm / 1.57 Axle Bolt Length: 75mm / 2.95 Total Weight: 700g Package Includes: 2 x 6-inch gray front spare wheels 2 x axle screws