The overall dimension of the wheel (diameter x width) is 150mm x 24mm or 5.9 x 0.94, the inner diameter of the center bearing is 8mm or 0.3, and the length of the axle screws is 75mm or 2.95. (Please check the detailed dimensions on the third picture before purchasing ) Package includes 2x Gray Front Spare Wheels, 2x Axles, easy and convenient to install without complicated steps, saving your effort and cost. time. Made of high quality and environment-friendly rubber material, this solid replacement wheel set is anti-slip and dustproof with strong wear resistance and load-bearing capacity. Wide application on handicapped vehicles, health care vehicles, etc., compatible with most wheelchairs, walkers, walkers or other replacement accessories with 6" wheels. This front wheel replacement set will provide a quiet, smooth and light ride on all surfaces, suitable for indoor and outdoor use, economical, practical and long term to use Choose c and 6 inch rubber wheel replacement set for wheelchairs, rollators, walkers and easily and conveniently replace them on your own Specification: Material: Solid Rubber Color: Gr ey Overall Wheel Dimension (Diameter x width): 150mm x 24mm or 5.9 x 0.94 Center bearing inner diameter: 8mm or 0.3 Distance between bearings on both sides : 40mm or 1.57 Axle bolt length: 75mm or 2.95 Total weight: 700g Package includes: 2 x 6 inch black front spare wheels2 x axle screws