These chair raisers are specially designed to grip chair legs. The plastic sleeves with domed bases and integral fins give a good pressure fit on legs up to 4.5cm (1 3/4") diameter without damaging the wood. The inner blocks (included) give a raise of 3" (7.5cm), 4" (10cm) or 5" (12.5cm). Useful for odd-shaped legs. Supplied in a pack of 4. Please refer to our Buying Guide on how to measure the correct seat height for you.