The overall wheel dimension (diameter x width) is 150 mm x 24 mm / 5.9 x 0.94, the inner diameter of the central bearing is 8 mm / 0.3, and the length of the axle screws is 75 mm / 2.95. (Please check the detailed measurements in the third image before purchasing!!) The package includes 2 gray front wheels, 2x axles, easy and convenient to install without complicated steps, saving your effort and time. 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. Wide application to disability vehicles, healthcare vehicles, etc., compatible with most wheelchairs, rollators, or other 6-wheel replacement accessories. This front wheel replacement set provides a quiet, smooth, and easy roll on all surfaces, suitable for indoor and outdoor use, economical, practical, and long-lasting to use. Choose this 6-inch rubber wheel replacement set for wheelchairs, rollators, and replace them easily and conveniently yourself! Specification: Material: Solid Rubber Color: Gray Overall Wheel Dimension (Diameter x Width): 150 mm x 24 mm / 5.9 x 0.94 Central Bearing Inner Diameter: 8 mm / 0.3 Distance between bearings on both sides: 40 mm / 1.57 Axle Screws Length: 75 mm / 2.95 Total Weight: 700 g Package includes: 2 x 6 inch Black Front Wheels 2 x Axle Screws