Usage Tips:Use rubber material to Integrally molded, mute, wear, Matched double bearings, flexible rotation, can also withstand a lot of weight. And Replacement Wheels for Suitcase, Roller Skate,Caster Board, Scooter, capable of fitting a 45mm wheel. Very Quiet Running, Anti-abrasive, Absorbs Shock.Size: OD 50* W18mm/1.97inch x 0.71inch ; Standard Center Bearing ID - 6mm(0.24inch ); Axles 30mm(1.18inch ) and 35mm(1.38inch ).Easy Operation - 1. Use a hacksaw to cut off the pole which connects the wheels. 2. Put on the with the included accessories.Package Includes: 4 x 1.97in Wheels, 4 x 1.18in Axles, 4 x 1.38in Axles, 8 x Axles screws, 8 x Washers, 2 x Wrenches.Colour:blackMaterial:rubberPackage Contents:1 Set x Luggage Replacement WheelsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.