Highlights: 1. High quality rubber material, durable and super quiet. 2. Brand new and high quality luggage replacement wheels. 3. Standard center bearing bore is 6mm (.236"). 4. Wheel size: 50mm*18mm/40mm*18mm/45mm*18mm/54mm*18mm/60mm*18mm/64mm*18mm 5. Fit and easy to install. The product is of good quality and value for money. Bought two sets of wheels to replace all 4 wheels in your suitcase. 6..3 month money back and replacement guarantee. describe: Specification: Colour: Black Material: Rubber, Metal Bearing outer diameter: 21mm Bearing inner diameter: 6mm Wheel diameter: 40mm -60mm optional Wheel thickness: 18mm Wheel + shaft length and thickness: 23mm Shaft length: 35mm/30mm Please note that before ordering you will need: 1. Measure the original wheel outer diameter (wheel size). 2. Measure the inner width of the wheel groove (the width of the total installed width). 3. Rivet screws through the length measuring wheel (excluding nuts at both ends) 4. Measure the tube thickness (ie the inner diameter of the bearing) by the wheel rivet thread diameter ❤ Package includes: Package A 4 X luggage replacement wheels, 4x axles. 4 X-axes (30MM) for 40mm wheels 4X Axle Screws 2 X wrenches 8 washers 8 bearings Package 2 4 X luggage replacement wheels, 4x axles. 4 X-axes (35MM) for 50mm wheels 4X Axle Screws 2 X wrenches 8 washers Package three Accessories included (2 30mm axles, 2 35mm axles, 4 axle screws, 8 washers, 2 wrenches) notes: 1. There is an error of plus or minus 1~3mm in the size of the set, which can be adjusted with a shim, which does not affect the use. 2. The item will be shipped from China and then shipped from Serahan. So it takes 7-15 days for delivery. Our products are reasonably priced and we believe you get the best value for your money. So please be patient! thanks. If you have any questions, please contact us and we promise to work hard to help you solve the problem. ^_^