Replacement 10 10 glider mechanism for chair. This furniture part will repair, replace or add glider motion to any chair with a suitable mounting surface (determined by mounting width). It is a dash 1 glider and comes in the following mounting widths: 19.5", 20.5", 21.5", 22.5", and 23.5". Please carefully measuse the base of your chair to determine the correct width for mounting this glider mechanism. This glider is commonly added with our swivel plate and ring bases to add swivel and glider motion to a chair. Swivel plate and ring base is not included. If you have any questions regarding how to make for the right fit, please contact customer service.