Features: High quality Luggage Replacement Wheels. Deluxe Wear-resisting and sound off Wheel, with high quality bearing and axles. Standard Center Bearing ID is 6mm (.236"). Multi-Size roller available and Completed with additional accessories: Four (4) pieces Two (2) different Size axles, Four (4) pieces screws, Four (4) pieces washers and 2 pieces wrenches. Easy to replace and install.   Specifications: Material: Rubber and steel. Available Wheel Size (Outer Diameter * Thickness): 40 *18 mm / 45 * 18 (mm) / 50 * 18 (mm) / 54 * 18 (mm) / 60 * 18 (mm) / 64 * 18 (mm) / 70 * 22 (mm) / 80 * 24 (mm) Available Axle Size (Inner Space): 30mm, 36mm, 40mm.  .