The Duo cup and mug handle is designed to fit on your favourite mug to increase grip and stability. The Duo allows you to use the same cups and glasses as friends, rather than two handled mugs and beakers. The easy clip-on design makes it quick and simple to attach and detach. The Duo helps to protect your hands and fingers from hot mug surfaces. It is ideal for use at home, in cafes or restaurants. The Duo can also be used with glasses and bottles. Designed to fit mugs/glasses from 70-90 mm (33.5 inches) in diameter.