The set of four protective buffers fit on each leg and provide a barrier for the trolley, stopping it from impacting on doors and walls. This keeps the trolley in good condition and protects the decor of the building. The protective buffers fit all Halifax, Hastings and Harrogate Surgical Trolleys. This product will require you to complete a specials form as certain items are unable to be returned unless faulty. Our customer care department will contact you in due course following your order.