Item Weight: 300 g Mounting Type: Stem Mount Load Capacity: 45 kg Caster Type: Stem Installation Type: M8x15mm Threaded Stem Package Contents: 4 x Screw-in Casters (50mm Diameter) Includes a simple wrench. ⚠️ Please be sure to check the caster size before purchasing. Also, the screw size is metric M8 coarse thread (maximum screw diameter is 8 mm), so please confirm the screw size before purchasing. One has a scratch on the side. Please purchase only if you don't mind. I have another set available. Bulk purchase possible. Material: Iron (zinc-plated), Nylon. Each wheel can bear a weight of 45 kg. For wheel repair of shopping carts, suitcases, carry boxes, etc., and caster replacement. Easily replace worn casters yourself. Made of high-quality solid rubber. Provides smooth rotation and full swivel action while protecting the floor. Screw-in casters, threaded casters, swivel casters with stoppers, 50mm swivel, M8 8mm A-type screw-in, wagon, shopping cart, furniture, replacement tire kit, DIY, twin wheels, hard rubber casters, 50 diameter, set of 4, 22-35$1930.1410.1030 shipping 520