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 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 / 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 black front spare wheels2 x axle screws