Twin Wheel Carpet Glides are designed to fit perfectly to a 45mm twin wheel castor to stop the glide falling off, unlike many other castor cups, the wheel simply snaps into position when pushed into the cup and stays in position. The smooth, domed base allows for easy movement across carpeted floors. Manufactured in the UK to a high quality. Each pack contains 4 Carpet glides. The ideal solution to prevent castors marking or damaging flooring.