Medeci chair raisers enable chairs to be easily raised to the height required for the individual user. The chair raisers are easily fitted to a very wide range of chairs with no need for any tools. Armchairs and other chairs with castors can be raised from 100mm (4") to 178mm (7"), whilst chairs with wooden legs can be raised from 50mm (2") to 127mm (5"). The chair raisers are suitable for uneven floors and are unobtrusive, reducing the risk of tripping. Each set is supplied with four castor replacement bobbins so that when fitting to a chair with castors, the castors can be replaced with the bobbins for an even more secure fit.