Description: 【Premium Material】: These stair climbing wheels are made of sturdy stainless steel and plastic material, wear resistant and ensure a long time to use, smooth and stable. 【Stable Design】: Featuring a stable triangle structure design, these foldable cart wheels offer enhanced stability when transporting goods. It ensures your shopping cart remains balanced even when fully loaded. 【Versatile Use】: These swivel caster wheels are suitable for shopping carts, grocery carts, laundry carts, foldable carts, stair climbing carts, trolley carts, hand trucks, luggage carts, etc. (Note: The axle diameter needs to be 7mm-8mm, and axle length needs to be more than 45mm) 【Easy Installation】: These trolley triangle wheels can be installed or removed with ease and convenience, directly replace the old or broken wheels. 【Convenient Helper】: The trolley casters serve as a reliable helper to transport goods effortlessly, making your shopping trips easier and more efficient. Specification: Product size: total length 21cm/8.27inch Wheel diameter 9cm/3.54inch Material: stainless steel plastic Package Includes: 1 Pair/2 Pieces Stair Climbing Wheels Note: Please allow slightly errors 1-2cm differences due to manual measurement.