This Trolley Cover Leather Luggage Luggage Mute Damping Wheels,The wheels carry flexible, easy access. Single load 60kg, no off phenomenon, silence and flexibility are completely safe to use. Material: Metal + Rubber Bearing OD:19mm Color: Black Bearing ID:6mm Wheel Diameter: 40mm Wheel Thickness: 18mm Axles Length: 35mm Features: Wear, Mute, Load Capacity, Double Bearing, Rotating Flexible, Sliding Effort, No Effort, Than The Original Luggage Wheels Are Easy To Use. You need to measure the following data to know what size you are suitable for with wheelsMeasuring the original wheels with an outer diameter (wheel size). Interior width of the measuring wheel groove (width of the installed width). By the measuring wheel bolt to measure the length (excluding the nuts at both ends)Measured by the thickness of the pipe of the diameter of the wheel bolt (i.e. the width of the bearing hole)Package Included: 2 sets luggage case spare wheels (2 wheels, 2 axles, 2 bolt axles, 4 bearings, 4 washers, 2 wrenches)Note: the light and different displays may cause the color of the item in the picture slightly different from the real thing. The allowed measurement error is +/- 1-3cm.