The overall wheel dimension (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 bolts on the axle is 75mm/2.95. (Please check the detailed measurements on the third photo before purchasing!!) Package includes 2 gray front spare wheels, 2 axles, easy and convenient to assemble without any complicated steps, save your effort and time. High quality eco-friendly rubber material, this solid spare wheel set is anti-slip and dustproof with strong wear resistance and load-bearing capacity. Wide application on vehicles disabled, healthcare vehicles, etc., compatible with most wheelchairs, walkers, walkers or more 6-wheel aftermarket accessories. This front wheel replacement set provides a smooth, smooth and light ride on all surfaces, suitable for indoor and outdoor use, economical, practical and long term Choose this replacement 6 inch rubber wheel set for wheelchairs, walkers, rollators and easy and convenient to