The Grip On Raisers use a ‘doughnut’ to grip on to the furniture meaning no tools are needed. The raiser becomes attached to the furniture without damaging it, giving increased safety over cone raisers. The Grip On raisers are provided as a set of four with a 3 inch (7.5cm) raise made up of individual 1 inch (2.5cm) sections. A raise height can be set as low as just 1 inch (2.5 cm), or as high as 5 inches (12.7 cm). Max Leg/Castor Diameter: K100: 1 1/4 inch (32mm) Please note: Furniture must not be moved once raisers are fitted. Weight limit: 500 kg / 78 stone / 1100lbs