The overall dimension of the wheel (diameter x width) is 150mm x 24mm / 5.9 x 0.94, the inner diameter of the central bearing is 8mm / 0.3 and the length of the axle bolts is 75mm / 2.95. (Please check the detailed dimensions in the third picture before purchasing) The package includes 2 x gray front spare wheels, 2 x axles, easy and convenient installation without complicated steps, saving time and effort. Made of high-quality and environmentally friendly rubber material, this solid replacement wheel set is non-slip and dustproof with strong wear resistance and load capacity. Widely applied to disabled vehicles, healthcare vehicles, etc., compatible with most wheelchairs, rollators, walkers or other replacement accessories with 6 inch wheels. This replacement front wheel set will provide a quiet, smooth and easy ride on any surface, suitable for indoor and outdoor use, economical, practical and long-lasting to use Choose c and 6 inch rubber brake set for wheelchairs, rollators, walkers and replace them easily and conveniently by yourself Specification: Material: Solid Rubber Color: Gray Total wheel dimension (Diameter x width): 150 mm x 24 mm / 5.9 x 0.94 Inner diameter of the central bearing: 8 mm / 0.3 Distance between bearings on both sides: 40 mm / 1.57 Axle bolt length: 75 mm / 2.95 Total weight: 700 g Package includes: 2 x 6 inch black spare front wheels2 x axle bolts