Color: Black Material: rubber metal Bearing diameter: 21mm Internal bearing diameter: 6 mm Wheel diameter: 50 mm Wheel thickness: 18 mm Shaft length: 35 mm Installation: A simple roll of luggage, without professional guidance, can be installed by yourself, which is very convenient Pay attention to the tightness of the wheels during installation, so that the luggage rollers can roll better Advantages: High quality spare wheels Solid, quiet, load-bearing, double bearings, flexible rotation & nbsp; Carrier: a single suitcase can load up to 51 kg without deviation, and its use is safe and reliable & nbsp; Cleaning: Replacement luggage wheels are easy to clean, and the wheels can be removed and cleaned