Set of 4 Replacement Swivel Rubber Suitcase Wheels, 45 x 18 mm APPLICATION - replacement wheels for suitcases, trolleys, or inline skates. When old wheels are damaged, our replacement rollers are a more economical solution to extend the life of your luggage because you don't need to buy a new travel bag. MATERIAL - Rubber and metal. The wheels are made of high-quality rubber and therefore can support a large weight. With more stable, wear-resistant bearings, the wheels roll smoothly and quietly to work well in the trunk. INSTALLATION - Easy to install. First use a hacksaw or other device to remove the bar from the original wheel, then install it with the included replacement casters. Features: Materials: Rubber and metal. Wheel outer diameter: 45 mm. Diameter inner diameter of the bearing: 18mm Inner diameter of the central bearing: 6 mm. Axles: 30/35 mm. Contents: 4 replacement wheels for suitcase. 8 *axles. 8 *screws axle 2* keys. 8 *spacers Tips: Please check the size picture