Colour: black Material: rubber, metal Wheel diameter: 40mm Wheels Thickness: 18mm Features: wear, mute, load-bearing, double bearing, rotating flexible, Sliding effort, without effort, than the original luggage wheels are easy to use. Buyers need to measure the following data to know what size you are suitable with wheels measuring the original outer diameter wheels (wheel size). the inside of the measuring wheel groove width (width of the total installed width). through the length measuring wheel rivet screw screw (excluding nuts at both ends) measured through the wheel rivet screw diameter pipe thickness (ie bearing bore width) Note: The length of the screws with the error of plus or minus 1 to 3 mm, can be adjusted using gasket, does not affect use. Package include: 2 pcs of Luggage Suitcase Replacement Wheels (2 Wheels, 2 Axles,2 Axles screws,4 Washers, 2 Wrenches)