【For Replacement and DIY】Replace the wheels of your beloved suitcases and carry-on boxes when they deteriorate! Great for DIY projects! 【Excellent Running Performance, Durable and Heavy-Duty】High-quality PU rubber outer wheels and steel bearing mechanism provide smooth and anti-noise performance. Maximum load capacity (per wheel) is 50kg and is resistant to deterioration. 【Specifications】Tire Diameter: 40mm, Width: 18mm; Bearing Inner Diameter: 6mm, Bolt Length: 35/30mm (two types), Washer: 12mm, Screw Length: 12mm. Please confirm the tire diameter and width before purchasing. 【Set Contents】4 * Casters (40mm diameter), 8 * Bolts (axle 30mm*4, 35mm*4), 8 * Screws, 8 * Washers, 2 * Wrenches