The blox chair raisers are wooden blocks designed to fit under chair legs to increase the height of a chair. Ideal for someone who requires the bed or chair to be raised for the ease of getting up and getting out. Specifications: Blocks can accommodate a range of chair leg with a maximum diameter of 3cm, 5cm and 7.5cm. Blocks raise height to 7.5cm and can support 190kg. Comes as a set of 4.